УСТОЙЧИВЫЕ К ХЛОРУ ГИДРОФИЛЬНЫЕ ФИЛЬТРАЦИОННЫЕ МЕМБРАНЫ НА ОСНОВЕ ПОЛИАНИЛИНА

Изобретение относится к устойчивым к хлору фильтрационным мембранам, содержащим N-алкилзамещенные производные полианилина, для применения, например, для очистки воды и к способам их получения и применения. 6 н. и 17 з.п. ф-лы, 8 ил., 3 табл.

Диализная мембрана и способ её изготовления

VERFAHREN ZUR HERSTELLUNG VON POROESEN MEMBRANEN.

Prepn. of a highly porous membrane - by selective removal of polymers; useful as testing strips in urine analysis

Prepn. of a highly porous polymer membrane comprises: (i) dispersion of an insol. filler material into a soln. of at least two incompatible polymers which are in phase sepn. so that a homogenous soln. results, (b) application of (i) onto a carrier, performing a precipitative coagulation and (c) a solvent extn. of the membranes. Pref., the solvents are organic solvents such as alcohols, cyclic esters or ketones, the fillers are talcum, titanium dioxide, barium sulphate and the incompatible polymers are cellulose ester/polyvinyl ester and polyurethane/polyacrylate or acrylic copolymers. Also claimed is the membrane. USE/ADVANTAGE - (Claimed) The membranes are used as carrier matrices for testing strips such as for urine analysis. Compared to prior art, the new membranes are very absorbent and are uniformly wetted with the sample fluid.

Positiv geladene Polymermembranen

ASYMMETRISCHE MEMBRANEN AUF BASIS HYDROPHILER POLYURETHANE

VERFAHREN ZUR HERSTELLUNG VON DUENNEN, FEHLERFREIEN SILICONGUMMIFOLIEN BZW. -MEMBRANEN

Verfahren zur Herstellung einer Membran mit isoporöser trennaktiver Schicht mit einstellbarer Porengröße, Membran, Filtrationsmodul und Verwendung

Die Erfindung betrifft ein Verfahren zur Herstellung einer Polymermembran, insbesondere Flachmembran oder Hohlfadenmembran, mit einer isoporösen trennaktiven Schicht mit voreingestellter oder voreinstellbarer Porengröße, insbesondere einer Ultrafiltrationsmembran oder Nanofiltrationsmembran. Die Erfindung betrifft ferner eine entsprechende Membran und deren Verwendung sowie ein Filtrationsmodul. Es wird eine Polymerlösung mit wenigstens einem Lösungsmittel hergestellt, in dem wenigstens zwei verschiedene zuvor hergestellte amphiphile Blockcopolymere mit zwei verschiedenen Polymerblöcken und geringer Polydispersität gelöst werden. Aus der Polymerlösung wird die isoporöse Flachmembran oder Hohlfadenmembran hergestellt. Erfindungsgemäß sind die Polymerblöcke der wenigstens zwei verschiedenen Blockcopolymere in der Polymerlösung jeweils paarweise homogen miteinander mischbar und wird in der Polymerlösung ein homogener Blend aus den verschiedenen Blockcopolymeren hergestellt, wobei die verschiedenen ...

MODIFIZIERTE HOHLFASERMEMBRAN

Improvements in and relating to polymeric membranes

Large pore synthetic polymer membranes

POLYMERIC MICRO-POROUS MEMBRANES AND THEIR PRODUCTION

Membrane

PROCESS FOR PREPARING A MEMBRANE

PROCESS FOR PRODUCING A POROUS MATERIAL HAVING A FINE PORE SIZE

COMPOSITE MEMBRANES FOR MEMBRANE DISTILLATION AND RELATED METHODS OF MANUFACTURE

COMPOSITE MEMBRANES FOR MEMBRANE DISTILLATION AND RELATED METHODS OF MANUFACTURE

Composite membranes for membrane distillation and related methods of manufacture

Composite mixed matrix membranes for membrane distillation and related methods of manufacture

Composite mixed matrix membranes for membrane distillation and related methods of manufacture

Composite membranes for membrane distillation and related methods of manufacture

Composite mixed matrix membranes for membrane distillation and related methods of manufacture

Composite membranes for membrane distillation and related methods of manufacture

HIGH FLUX DIALYSIS DIAPHRAGM WITH IMPROVED SEPARATION BEHAVIOR

PERMIAN-SELECTIVE DIAPHRAGM AND MANUFACTURING PROCESS FOR IT

LARGEPOROUS DIAPHRAGM FROM SYNTHETIC POLYMERS

Selectively permeable graphene oxide membrane

Described herein is a crosslinked graphene and biopolymer (e.g. lignin) based composite membrane that provides selective resistance for gases while providing water vapor permeability. Methods for making such membranes, and methods of using the membranes for dehydrating mixtures, are also described.

Hydrophilic membrane

Porous hollow fiber membrane

The purpose of the present invention is to provide a porous hollow fiber membrane that has high strength while maintaining high purified water permeability. This porous hollow fiber membrane is formed from a fluororesin polymer, wherein there is a columnar structure oriented in the longitudinal direction of the porous hollow fiber membrane, and the molecular chain of the fluororesin polymer is oriented in the longitudinal direction of the porous hollow fiber membrane.

Self-wetting porous membranes (I)

Disclosed is a self-wetting porous membrane comprising an aromatic hydrophobic polymer such as polysulfone and a wetting agent comprising a copolymer of formula A-B or A-B-A, wherein A is a hydrophilic segment comprising a polymerized monomer of the formula (1): CH2=C(R')(R2), wherein R1 and R2 are as described herein, and B is an aromatic hydrophobic polymeric segment, wherein segments B and A are linked through an amidoalkylthio group. Also disclosed is a method of preparing a self-wetting membrane comprising casting a solution containing an aromatic hydrophobic polymer and the wetting agent, followed by subjecting the cast solution to phase inversion. The self-wetting porous membrane finds use in hemodialysis, microfiltration, and ultrafiltration.

DEFECT-FREE ULTRAHIGH FLUX ASYMMETRIC MEMBRANES

IMPROVED METHOD TO MAKE CARBON MOLECULAR SIEVE HOLLOW FIBER MEMBRANES

An asymmetric hollow fiber (CMS) carbon molecular sieve is made by providing a dope solution comprised of a polvimide and a solvent, at a temperature greater than 250°C that is less than the storage modulus at a temperature of 250°C, but no more than ten times less as measured using dynamic mechanical thermal analysis from 250°C to a temperature where the polyimide carbonizes. The polvimide is shaped into a hollow polvimide fiber, the solvent removed and the polyimide hollow fiber is heated to pyroiyze the polvimide and form the asymmetric hollow carbon molecular sieve. The asymmetric hollow fiber carbon molecular sieve has a wall that is defined by an inner surface and outer surface of said fiber and the wall has an inner porous support region extending from the inner surface to an outer raicroporous separation region that extends from the inner porous support region to the outer surface. Surprisingly, when the polyimide has the particular storage modulus characteristics, the method allows ...

COATING DEVICE AND PROCESS FOR COATING FORMED SHEET MEMBRANE ELEMENT

A coating device having one or more dope outlets, a coating knife, and a guide section configured to engage the protrusions on a membrane substrate, the coating device defining a slot adapted to receive the membrane substrate. A process for coating a permeate sheet having protrusions formed thereupon consists of drawing the permeate sheet through a coating knife having a pattern corresponding to the permeate sheet while providing a dope to both sides of the sheet. Another device and process incorporates a cylindrical roller and a platen.

Ultrafiltration membrane and manufacturing method thereof.

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung einer Ultrafiltrationsmembran mit starken mechanischen Eigenschaften. Bei der vorliegenden Erfindung wird, da die Cellulose, die in die Membran-Giesslösung hinzugegeben wird, eine hohe mechanische Eigenschaft besitzt, die Rückhalterate der Ultrafiltrationsmembran der vorliegenden Erfindung verbessert.

ИСКУССТВЕННАЯ РАЗДЕЛИТЕЛЬНАЯ МЕМБРАНА

HAVING COPOLYMER MEMBRANES Of ETHYLENE/ALCOOL VINYL OF the CHARACTERISTICS OF PERMEABILITY AMELIOREES, AND PROCEEDED FOR THEIR PRODUCTION

REVERSE OSMOSIS MEMBRANES

AN IMPROVED PROCESS FOR THE MANUFACTURE OF MEMBRANES WITH SELECTIVE PERMEABILITY

PROCESS FOR PREPARING CELLULOSE ESTER REVERSE OSMOSIS MEMBRANES ON FLEXIBLE WEBS HAVING ENHANCED RELEASABILITY

SELF-WETTING POROUS MEMBRANES (I)

BACKWASHABLE FILTRATION ELEMENT

Planar filtration element, comprising a planar support structure (11) and at least one filtration layer (12, 13) made of a membrane material, wherein the planar support structure has first and second opposite outer surfaces (111, 112) spaced apart and secured by spacing members (113) to define a drainage compartment (114) between said first and second outer surfaces,wherein at least one of said first and second outer surfaces comprises through-openings (115) for fluid connection with the drainage compartment (114), and wherein the outer surfaces (111, 112), when one disregards the through-openings, are formed of a material extending continuously throughout the outer surfaces, characterised in that the filtration layer (12, 13) coats the outer surface such that the membrane material penetrates the through-openings (115) so as to anchor the filtration layer (12, 13) to the support structure (11).

ION-PERMEABLE MEMBRANE AND THE PRODUCTION THEREOF

The invention relates to a method for the production of an ion-permeable membrane with a profiled surface, wherein a shaping element is brought into contact with an uncured polymer film containing at least one polymer, creating a preferably regular pattern of similarly or differently structured ridges and/or depressions, an ion-permeable membrane that may particularly be produced using such a method, a membrane arrangement comprising at least one such ion-permeable membrane, and a method for the electrodialytic desalination of liquids in which at least one such membrane arrangement is used.

MEMBRANES CONSISTING OF POLYAZOLES, METHOD FOR THEIR PRODUCTION AND FUEL CELLS USING SUCH MEMBRANES

The membranes according to the invention can be obtained from polyazoles having an inherent viscosity of greater than 1.1 dl/g by means of a method having the following steps: a) preparation of a solution of the polyazoles in organic solvents, b) shaping the obtained solution to form a membrane shape, c) heating of the solution which has been brought into the membrane shape to a temperature in the range of from 50 to 90°C until a self-supporting membrane has been formed, and d) tempering the membrane obtained from step c) at increasing temperatures in the range of from 120 to 500°C until the content of solvents in the membrane is less than 5% by weight. The membranes according to the invention can be used in high-temperature fuel cells. They have increased mechanical stability and, after doping with phosphoric acid, have a high degree of long-term stability at the operating temperatures of the high-temperature fuel cells up to 250°C.

MICROPOROUS MEMBRANE AND METHOD FOR FORMING

The present disclosure describes a method for forming microporous membranes. More specifically, vapor induced phase separation techniques are used for forming multizone microporous membranes having improved material throughput.

CARBON FILM FOR FLUID SEPARATION, FLUID SEPARATION FILM MODULE, AND METHOD FOR PRODUCING CARBON FILM FOR FLUID SEPARATION

The present invention provides a carbon membrane for fluid separation with which a high-pressure fluid can be separated and purified and which has excellent pressure resistance and is less apt to be damaged. The present invention relates to a carbon membrane for fluid separation, including: a core layer which has a co-continuous porous structure; and a skin layer which has substantially no co-continuous porous structure and is formed around the core layer.

Multi-component composite membrane and method for preparing the same

The present invention relates to a multi-component composite separate membrane and a method for preparing the same, and to a multi-component composite membrane comprising a support layer and active layers, wherein the support layer is located between the active layers.

Asymmetric Nanotube Containing Membranes

This invention relates to heterogenous pore polymer nanotube membranes useful in filtration, such as reverse osmosis desalination, nanofiltration, ultrafiltration and gas separation.

POLYIMIDE MEMBRANES MADE OF POLYMERIZATION SOLUTIONS

The invention relates to polyimide membranes and to a phase inversion method for the production thereof. The polyimide membranes can be used to separate different gas mixtures.

Preparation, regeneration and application of a chelating microfiltration membrane

A polyvinylidene fluoride (PVDF) casting membrane solution is shaped as a flat sheet membrane by thermally induced phase separation (TIPS), the PVDF membrane is defluorinated with an alkaline potassium permanganate solution, and then the carbon chain is extended with glycidyl methacrylate (GMA) as the graft monomer, and finally the nucleophilic substitution is carried out between melamine and GMA to produce a chelating microfiltration membrane for capturing and enriching heavy metals with high flux and high capacity.

Hollow fiber membrane and process for producing the same

Membrane with localized asymmetries

Membranes with localized asymmetries, devices including the membranes, and methods of making and using the membranes, are disclosed.

Method of manufacturing membranes and the resulting membranes

This invention provides a process for making microporous membranes from a polymer solution and the membranes therefrom. A thermal assist, such as heating of the polymer solution can be effected subsequent to shaping the solution, such as by forming a film, tube or hollow fiber of the solution under conditions that do not cause phase separation.. In a preferred embodiment, the formed solution is briefly heated to generate a temperature gradient through the body of the formed solution. The polymer in solution then is precipitated to form a microporous structure. The formation of a wide variety of symmetric and asymmetric structures can be obtained using this process. Higher temperatures and/or longer heating times effected during the heating step result in larger pore sizes and different pore gradients in the final membrane product.

Positively charged polymer membranes

METHOD OF MAKING IMPROVED POLYIMIDE SEPARATION MEMBRANES

A polyimide separation membrane is comprised of a polyimide, a halogen compound (e.g., halogenated aromatic epoxide) that is soluble in the polyimide and a hydrocarbon having 2 to 5 carbons (e.g., ethane, ethylene, propane or propylene). The gas separation membrane has improved selectivity for small gas molecules such as hydrogen compared to polyimide membrane not containing the halogen compound or hydrocarbon. The polyimide separation membrane may be made by shaping a dope solution comprised of a polyimide, a halogen containing compound that is soluble in the polyimide, removing the solvent and then exposing the untreated polyimide membrane to a treating atmosphere comprising a hydrocarbon having 2 to 5 carbons for a sufficient time to form the polyimide membrane.

METHOD OF MANUFACTURING MEMBRANE AND RESULTING MEMBRANE

PROBLEM TO BE SOLVED: To provide a process for making a microporous membrane from a polymer solution, and the resultant membrane. SOLUTION: A thermal assist, such as heating of the polymer solution, can be effected subsequent to the shaping of the polymer solution, such as by forming a film, tube or hollow fiber of the polymer solution under conditions that do not cause phase separation. In a preferred embodiment, the formed solution is briefly heated to thereby cause a temperature gradient through the body of the formed solution. The polymer in solution then is precipitated to form a microporous structure. Wide variety of symmetric and asymmetric structures can be formed using this process. A higher temperature and/or a longer heating time effected during the heating step result in larger pore sizes and different pore gradients in the final membrane product. COPYRIGHT: (C)2007,JPO&INPIT ...

イオン透過性ウエブ強化セパレータの製造装置及びプロセス並びにそれを用いて得られるセパレータ

... 事前に計量された量のドープを細長い多孔性ウエブの両方の面に同時に提供するための略垂直方向を持つ上部スロット面および下部スロット面をそれぞれが有する2つのスロットを含む両面型含浸装置[10](ただし、両方の面上の前記量は略同一である)と、前記両面含浸装置を通る前記細長い多孔性ウエブの下向きの輸送を提供する輸送手段、ならびにその後の相反転ステーション[11](ただし、前記下向きの輸送は、略垂直方向を持つ)と、凝析ステーション[12]と、洗浄ステーションとを含む、イオン透過性ウエブ強化セパレータを製造するための装置であって、前記相反転ステーション[11]により、前記ドープの相反転が提供され、前記凝析ステーション[12]により、得られた相反転ドープからの凝析および溶媒の洗浄が提供され、前記両面含浸装置[10]と前記相反転ステーション[11]との間にエアーギャップがあり、各含浸装置の下部面間の距離が各含浸装置の上部面間の距離より大きい。 ...

ПЛЕТЕНАЯ ПОДЛОЖКА ДЛЯ ТРУБЧАТЫХ МЕМБРАН

Способ изготовления упрочненной трубчатой полимерной мембраны содержит шаги изготовления из мононити бесшовной пористой трубчатой подложки, пропитывания трубчатой подложки мембранной пастой и регулирования внутреннего и внешнего диаметра мембраны. Устройство для пропитывания содержит формовочную насадку и отверстие для регулировки внутреннего и наружного диаметров мембраны. Трубчатая полимерная мембрана содержит трубчатую подложку и мембранное вещество. Трубчатая подложка выполнена из мононити и имеет достаточно открытую структуру (отверстия более 0,1 мм). Зацепляющиеся и/или соприкасающиеся части упомянутой нити могут быть связаны перед пропиткой подложки мембранной пастой. Подложка может содержать петли мононити, которые также соединены. Изобретение обеспечивает упрочненную трубчатую полимерную мембрану, обладающую улучшенной механической прочностью и улучшенной устойчивостью к обратной промывке. 3 н. и 19 з.п. ф-лы, 16 ил., 1 табл.

ПАСТА, ПРИГОДНАЯ ДЛЯ ТРАФАРЕТНОЙ ПЕЧАТИ, ДЛЯ ПОЛУЧЕНИЯ ПОРИСТОЙ ПОЛИМЕРНОЙ МЕМБРАНЫ ДЛЯ БИОСЕНСОРА

... 1. Паста, пригодная для трафаретной печати, для получения пористой полимерной мембраны, содержащая, по меньшей мере, один полимер, один или несколько растворителей полимера с температурой кипения >100°С, один или несколько нерастворителей (порообразователей) полимера с более высокой температурой кипения, чем у растворителя/растворителей и один гидрофильный модификатор вязкости. 2. Паста по п.1, отличающаяся тем, что разница в температурах кипения растворителя и порообразователя составляет, по меньшей мере, 30°С. 3. Паста по п.1 или 2, отличающаяся тем, что в качестве полимера паста содержит ацетат целлюлозы. 4. Паста по п.3, отличающаяся тем, что в качестве растворителя паста содержит 1,4-диоксан и/или 4- гидроксиметилпентанон и/или этилацетат. 5. Паста по любому из пп.1-4, отличающаяся тем, что в качестве порообразователя паста содержит длинноцепочечный спирт. 6. Паста по п.5, отличающаяся тем, что в качестве порообразователя паста содержит н-октанол и/или 2-метил-2, 4-пентандиол. 7. Паста ...

ПОЛИИМИДНЫЕ МЕМБРАНЫ ИЗ ПОЛИМЕРИЗАЦИОННЫХ РАСТВОРОВ

Изобретение относится к полиимидным мембранам, которые могут быть либо плоскими мембранами, либо мембранами из полых волокон. Полиимидные мембраны могут являться пористыми мембранами в виде микро-, ультра- или нанофильтрационных мембран или непористыми мембранами, применяемыми для разделения газов. Способ изготовления полиимидных мембран включает стадии получения полиимида путем поликонденсации ароматического диангидрида тетракарбоновой кислоты с ароматическим диизоцианатом в апротонном диполярном растворителе, приготовления содержащего полиимид литьевого раствора и изготовления полиимидной мембраны из литьевого раствора, причем полиимид не выделяют между первыми двумя стадиями в виде твердого вещества и не растворяют вновь, и причем изготовление мембраны осуществляют методом фазовой инверсии. Изобретение позволяет получить мембраны, обладающие хорошими механическими свойствами, стойкостью к воздействию давления в процессе эксплуатации и селективностью к различным газам. 3 н. и 12 з.п.

МЕМБРАНА С ИЗОПОРИСТЫМ АКТИВНЫМ РАЗДЕЛЯЮЩИМ СЛОЕМ И СПОСОБ ПОЛУЧЕНИЯ МЕМБРАНЫ

... 1. Способ получения полимерной мембраны с изопористым активным разделяющим слоем, в особенности - ультрафильтрационной мембраны или нанофильтрационной мембраны, включающий следующие стадии:получение поливочного раствора, содержащего по меньшей мере один растворитель, в котором растворены по меньшей мере один амфифильный блоксополимер с по меньшей мере двумя различными полимерными блоками и по меньшей мере один углевод,распределение поливочного раствора с получением пленки,испарение в течение периода ожидания близкой к поверхности доли по меньшей мере одного растворителя,осаждение мембраны посредством погружения пленки в осадительную ванну, содержащую по меньшей мере один осадитель блоксополимера.2. Способ по п. 1, отличающийся тем, что углевод является сахарозой, D(+)-глюкозой (виноградным сахаром), D(-)-фруктозой (фруктовым сахаром) и/или циклодекстрином, в частности - α-циклодекстрином.3. Способ по п. 1 или 2, отличающийся тем, что по меньшей мере один блоксополимер содержит два или три ...

HOCHGRADIG ASSYMETRISCHE, HYDROPHILE MIKROFILTRATIONSMEMBRANEN MIT GROSSEN PORENDURCHMESSERN

Synthetische Trennmembran

The description relates to a diaphragm, preferably suitable for haemodialysis, having a separating layer A with a cut-off between 500 and 5,000,000, a supporting layer B and a layer C helping to determine the hydraulic permeability. The separation limit and hydraulic permeability can be set mutually independently.

FEHLSTELLENFREIE ASYMMETRISCHE MEMBRAN MIT ULTRAHOHEM FLUSS.

Polymer membrane

A method of producing a membrane comprises providing a solution containing a plurality of polymers in a non-aqueous liquid solvent, at least one of the polymers (hereinafter referred to as the "first polymer") having been prepared by polymerizing at least one vinyl or acrylic monomer, at least one other of the polymers being a membrane-forming hydrophobic polymer (hereinafter referred to as the "second polymer"), the first polymer and the second polymer being mutually incompatible in said solution, and contacting the solution with an aqueous medium thereby to precipitate the polymers from the solution to form the membrane. In the examples the first polymer is polymethylmethacrylate, polyethylmethacrylate, poly[2-hydroxy ethyl]methacrylate, polyhydroxypropyl methacrylate, poly 1-vinyl imidazole, and the second polymer is a polyethersulphone in all cases. The membranes are produced by dissolving the polyethersulphone in a mixt. of N-methyl pyrrolidone and 2-pyrrolidone and polymerising the ...

POLYMER SOLUTIONS

SCREEN PRINTING-ABLE PASTE FOR THE PRODUCTION OF A POROUS POLYMER DIAPHRAGM FOR A BIO SENSOR

POLYELEKTROLYTZUSAMMENSETZUNG FOR HUMIDITY SENSOR, AND PROCEDURE FOR THE PRODUCTION OF A POLYELEKTROLYTMEMBRAN FOR A SENSOR POLYELEKTROLYTTINTE BY INK RADIATION PRINTING

PROCEDURE FOR THE CONTINUOUS PRODUCTION OF A MICRO-POROUS DIAPHRAGM AND YOUR USE IN THE PROCEDURE FOR THE SEPARATION AND CLEANING NUCLEIC ACID

POSITIVELY CHARGING POLYMER DIAPHRAGMS

SEPARATION OF A CELL SUSPENSION IN A CELL MATERIAL AND A FILTRATE

POLYAMIDE MEMBRANES

HIGHLY CONDUCTIVE ORDERED ION EXCHANGE MEMBRANES

Method to make a yarn-reinforced hollow fibre membranes around a soluble core

A reinforced hollow fiber membrane Is made by applying reinforcing filaments (26) to a core (12), casting a dope over the filaments and core, forming a membrane from the dope, and removing the core. The core may be a moving core, and the reinforcing yarns may comprise warp yarns and a spiral wrap yarn. The core may be soluble and removed by dissolving it. The core may be pre -wrapped with a yam before the warp yarns are applied. The resulting reinforcing cage may be pre -shrunk before it is coated with a membrane dope. The pre -wrapped yarn may be removed, for example by dissolving it, after the reinforcing cage is coated.

Polyaniline-based chlorine resistant hydrophilic filtration membranes

... in one aspect, the invention relates to chlorine-resistant filtration membranes comprising n-alkyl substituted polyaniline derivatives for use in, for example, water purification, and methods for making and using same. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

Gas separation membrane

A method of forming a gas separation membrane including: depositing a first hydrophilic polymer solution; depositing on top of the firs hydrophilic polymer solution a second, different hydrophilic polymer solution thereby forming a two-layer polymer solution; forming the two-layer polymer solution into one of a forward osmosis membrane and a pressure retarded osmosis membrane by bringing the second, different hydrophilic polymer solution into contact with water to form the dense layer; coating one of the forward osmosis membrane and the pressure retarded osmosis membrane with a thin layer of a third, different, hydrophilic polymer more pH tolerant than the first and second hydrophilic polymer solutions to form a dense rejection layer thereon; and exposing one of the coated forward osmosis membrane and the coated pressure retarded osmosis membrane to a high pH solution. A gas separation membrane formed from the foregoing process.

SCREEN-PRINTABLE PASTE FOR PRODUCING A POROUS POLYMER MEMBRANE FOR A BIOSENSOR

The invention relates to a paste, which can undergo screen printing, for producing a porous polymer membrane. Said paste contains at least one polymer, one or more solvents for the poly-mer having a boiling point of > 100 .degree.C, one or more non-solvents for the polymers (pore-forming agents) having a higher boiling point than that of the solvent(s), and contains a hydrophilic viscosity mod-ifier.

PROCESS FOR PREPARING CELLULOSE ESTER REVERSE OSMOSIS MEMBRANES ON FLEXIBLE WEBS HAVING ENHANCED RELEASABILITY

SCREEN-PRINTABLE PASTE FOR PRODUCING A POROUS POLYMER MEMBRANE FOR A BIOSENSOR

The invention relates to a paste, which can undergo screen printing, for producing a porous polymer membrane. Said paste contains at least one polymer, one or more solvents for the polymer having a boiling point of > 100 ~C, one or more non-solvents for the polymers (pore-forming agents) having a higher boiling point than that of the solvent(s), and contains a hydrophilic viscosity modifier.

POROUS MEMBRANE OF POLY(METAPHENYLENE ISOPHTHALAMIDE) AND PROCESS FOR PRODUCING THE SAME

A porous membrane having a multiplicity of mutually communicating microcells and a process for producing the same. The porous membrane is comprised of highly heat resistant poly(metaphenylene isophthalamide). In the porous membrane, the open pore ratios of both major surfaces and difference therebetween fall within specified ranges, and further at both major surfaces, the average pore diameters and porosities fall within specified ranges. The porous membrane excels in permeability for substances such as air and water, impregnation characteristics and mechanical strength, and is suitable for use as core materials of filters, prepregs obtained through impregnation with curable resins, multilayer wiring boards, electronic package boards, etc.

PERMSELECTIVE MEMBRANE AND PROCESS FOR MANUFACTURING THEREOF

The present invention relates to a membrane being suitable for, for example, hemodialysis. Said membrane comprises at least one hydrophobic polymer and at least one hydrophilic polymer. According to the present invention the outer surface of the hollow fiber has pores in the range of 0,5-3 ~m and the numbers of said pores in the outer surface are in the range of 10, 000 to 150, 000 pores per mm2, preferably in the range of 18, 000 to 100, 000 pores per mm2, and most preferably in the range of 20, 000 to 100, 000 pores per mm2. The present invention further relates to a process for the preparation of said membrane and use of said membrane in hemodialysis, hemodiafiltration and hemofiltration, and in dialysis and filtration in general, for example in water purification or dehydration.

COMPOSITE MEMBRANE AND MOISTURE ADJUSTMENT MODULE USING THE SAME

A composite membrane and moisture adjustment module using the same is disclosed. The composite membrane includes a moisture-permeable resin layer interposed between porous membranes that constitute a pair; and the mean thickness of the moisture-permeable resin layer is 5 µm or less.

LARGE PORE POLYMERIC MEMBRANE

Porous membranes including a first microporous skin surface having a pore density of at least about 20 pores/50,000 µm2, and a second porous surface, and a bulk between the surfaces, wherein the bulk has a pore density of at least about 120 pores/mm2, as well as methods of using and methods of making the membranes are disclosed.

HIGH CUT-OFF HEMODIALYSIS MEMBRANES FOR THE TREATMENT OF CHRONIC HEMODIALYSIS PATIENTS

The present invention relates to high cut-off hemodialysis membranes for the treatment of chronic hemodialysis (CHD) patients, with the potential to improve long-term survival of these patients by reducing the risk of cardiovascular disease, through down-regulation of monocyte activation in the blood. Monocytes are the major circulating blood cells involved in the progression of cardiovascular disease. High cut-off hemodialysis in chronic dialysis patients results in a sustained decrease in expression of monocyte cell- surface proteins that direct the movement of these cells from the blood to the walls of blood vessels, where they promote the progression of arterial disease (atherosclero- sis) that leads to cardiovascular disease (CVD); heart dis- ease, strokes and peripheral vascular disease.

MULTILAYER MICROFILTRATION MEMBRANE

A microfiltration membrane comprising (a) an asymmetric layer, (b) an isometric layer, and (c) an interface layer between the asymmetric layer and the isometric layer, the interface layer having a first portion contacting the asymmetric layer and a second portion contacting the isometric layer; wherein, (i) the asymmetric layer has a region contacting the first portion of the interface layer, the region including cells having a first porous structure; (ii) the isometric layer has a region contacting the second portion of the interface layer, the region including cells having a second porous structure; the first porous structure being larger than the second porous structure; and the first portion of the interface layer comprises cells having the first porous structure, and the second portion of the interface layer comprises cells having the second porous structure, and methods of making and using the membrane, are disclosed. Also disclosed is a microfiltration membrane comprising (a) a first ...

BACKWASHABLE FILTRATION ELEMENT

Planar filtration element, comprising a planar support structure (11) and at least one filtration layer (12, 13) made of a membrane material, wherein the planar support structure has first and second opposite outer surfaces (111, 112) spaced apart and secured by spacing members (113) to define a drainage compartment (114) between said first and second outer surfaces,wherein at least one of said first and second outer surfaces comprises through-openings (115) for fluid connection with the drainage compartment (114), and wherein the outer surfaces (111, 112), when one disregards the through-openings, are formed of a material extending continuously throughout the outer surfaces, characterised in that the filtration layer (12, 13) coats the outer surface such that the membrane material penetrates the through-openings (115) so as to anchor the filtration layer (12, 13) to the support structure (11).

RADIATION CURED MEMBRANES DERIVED FROM POLYMERS THAT ARE CO-REACTIVE WITH AZIDE CROSSLINKING AGENT(S)

The present invention appreciates that compounds comprising nitrogen-containing moieties that are at least divalent (e.g., urea, urethane, amide, etc.) can be reacted with azides using at least radiation energy to initiate the reaction between at least a portion of the compounds and the azides to form membranes that have surprisingly high selectivities for acid gases relative to nonpolar gases such as hydrocarbons. The membranes are also resistant to CO2 plasticization and have high acid gas flux characteristics. The resultant membranes can be extremely thin (e.g., 10 micrometers or less), which promotes high permeability for the acid gas and can translate into high productivity on a scaled-up, industrial level.

LARGE PORE SYNTHETIC POLYMER MEMBRANES

Highly asymmetric polymeric membranes with large pores which yield bubble points in the range of 0.5 to 25 psid and superior flow char- acteristics. The membranes can be cast from both metastable dispersions and from homogenous casting formu- lations. The technique of synthesis involves exposure of the cast mem- brane to humid air to create large sur- face pores on the exposed side.

Process for producing an ion-permeable web-reinforced separator

PREPARATION OF ASYMMETRIC POLYMER MEMBRANES

HYDROPHILIC BLOCK COPOLYMER AND MEMBRANE PREPARED THEREFROM (I)

Disclosed is a block copolymer which is represented by chemical formula a-b-a (i) or a-b (ii) and comprises a block a and a block b, wherein the block a is a hydrophilic polymeric segment comprising polyglycerol, and block b is an aromatic hydrophobic polymeric segment. The block copolymer is used as a wetting agent in the preparation of porous membranes from aromatic hydrophobic polymers such as polyethersulfone. COPYRIGHT KIPO 2016 ...

MICROFILTRATION MEMBRANE WITH IMPROVED FILTRATION PROPERTIES

The invention relates to an integral asymmetric planar membrane for microfiltration made from at least 40 wt. % of a hydrophobic first sulphone polymer and a hydrophilic second polymer with a pore size distribution over the membrane wall, inside the wall of a separation layer and extending therefrom towards the surfaces with an increasing pore size, whereby the second surface has pores with an average diameter of at least 1 μm. The membrane comprises the hydrophilic second polymer in a concentration of 0.1-10 wt. %. The separation layer is located in a region facing the first surface and the pore size has a maximum in the connection to the asymmetrical region in the direction of the second surface. The invention further relates to a method for production of said membrane from a pouring solution comprising the hydrophobic first sulphone polymer and the hydrophilic second polymer in a solvent system, pouring the pouring solution maintained at moulding temperature to give a film on a support ...

IMPROVED METHOD TO MAKE CARBON MOLECULAR SIEVE HOLLOW FIBER MEMBRANES

Permselektivt membran och förfarande för tillverkning därav

Composite ionomeric membrane

A composite ionomeric membrane comprising a layer or film of a porous inert material on which a (per) fluorinated sulphonic ionomer is deposited wherein the sulphonic groups are at the end of short side chains (SSC), said ionomer having: equivalent weight comprised between 280 and 1,700 g/eq; side chains of formula: —O—CF 2 —CF 2 —SO 3 —M + , wherein M is hydrogen or an alkaline metal; said membrane having in each of the two orthogonal directions xy of the plane, after dipping in demineralized water at 100 ° C. for 30 minutes and preliminary drying at 105 ° C. under vacuum for one hour, the following size variations: in one direction, size variation lower than 25 %; in the other direction, size variation lower than 20 %.

Gas separation membrane

A method of forming a gas separation membrane including: depositing a first hydrophilic polymer solution; depositing on top of the first hydrophilic polymer solution a second, different hydrophilic polymer solution, thereby forming a two-layer polymer solution; forming the two-layer polymer solution into one of a forward osmosis membrane and a pressure retarded osmosis membrane by bringing the second, different hydrophilic polymer solution into contact with water to form the dense layer; coating one of the forward osmosis membrane and the pressure retarded osmosis membrane with a thin layer of a third, different, hydrophilic polymer more pH tolerant than the first and second hydrophilic polymer solutions to form a dense rejection layer thereon; and exposing one of the coated forward osmosis membrane and the coated pressure retarded osmosis membrane to a high pH solution. A gas separation membrane formed from the foregoing process.

Thermally, heat and chemically resistant ultrafiltration polyimide membrane and method for its production

A thermally, heat and chemically stable polyimide asymmetric ultrafiltration membrane, is a porous film or a hollow fiber, having an anisotropic structure a selective surface layer and a substrate, wherein the selective ultraporous surface layer has size of pores 70-800 Å with thickness 0.1-10 mcm and is composed of insoluble rigid-chain aromatic (co)polyimide based on dianhydride of aromatic tetracarbonic acid and aromatic diamine and located on the microporous substrate with thickness 50-250 mcm, and the membrane has water permeability Q=(2-500)·10 −4 cm/sec atm and nominal molecular weight cutoff M L =(5-500)·10 3 g/mol, and method for producing an ultrafiltration membrane as disclosed.

Multilayer microfiltration membrane

A microfiltration membrane comprising (a) an asymmetric layer, (b) an isometric layer, and (c) an interface layer between the asymmetric layer and the isometric layer, the interface layer having a first portion contacting the asymmetric layer and a second portion contacting the isometric layer; wherein, (i) the asymmetric layer has a region contacting the first portion of the interface layer, the region including cells having a first porous structure; (ii) the isometric layer has a region contacting the second portion of the interface layer, the region including cells having a second porous structure; the first porous structure being larger than the second porous structure; and the first portion of the interface layer comprises cells having the first porous structure, and the second portion of the interface layer comprises cells having the second porous structure, and methods of making and using the membrane, are disclosed. Also disclosed is a microfiltration membrane comprising (a) a first asymmetric layer, (b) a second asymmetric layer, and (c) an interface layer between the first asymmetric layer and the second asymmetric layer, the interface layer having a first portion contacting the first asymmetric layer and a second portion contacting the second asymmetric layer; wherein, (i) the first asymmetric layer has a region contacting the first portion of the interface layer, the region including cells having a first porous structure; (ii) the second asymmetric layer has a region contacting the second portion of the interface layer, the region including cells having a second porous structure; the first porous structure being larger than the second porous structure; and the first portion of the interface layer comprises cells having the first porous structure, and the second portion of the interface layer comprises cells having the second porous structure, as well as methods of making and using the membrane.

Membrane with localized asymmetries

Membranes with localized asymmetries, devices including the membranes, and methods of making and using the membranes, are disclosed.

Block polymer composite membranes

A highly permeable sorbent platform based on polysulfone and polystyrene-b-poly(acrylic acid) composite membranes. The membranes possess a fully interconnected network of poly(acrylic acid)-lined pores, which enables the surface chemistry to be tailored through sequential attachment of polyethyleneimine moieties and metal-binding terpyridine ligands. The polyethyleneimine moieties increase the saturation capacity, while the addition of terpyridine enables high-affinity binding to a diversity of transition metal ions. This membrane platform removes such metal contaminants from solution. The metal capture performance of the functionalized membranes persists even in high concentrations of competitive ions. Also, fluorescence quenching of the terpyridine moiety upon metal ion complexation offers an in-situ probe to monitor the extent of sorbent saturation. The permeability, capacity, and affinity of these membranes, with high-density display of a metal-binding ligand, offer a chemically tailored platform to address the challenges that arise in ensuring clean water.

Filtration membranes

A porous membrane constructed of a cast polymeric film with a face located adjacent to at least a portion of the surface of a nanofiber substrate fabric. The membrane is not formed by lamination of two independent layers one layer being the film and the other being the substrate fabric. 1. A porous membrane comprising a cast porous polymeric film with a face located adjacent to and in contact with at least a portion of the surface of a nanofiber substrate fabric , wherein the substrate has a thickness and the membrane is prepared by a process comprising the step of casting the film directly onto the substrate fabric.2. The membrane of in which the film inter-penetrates the substrate fabric at least partially into the thickness of the substrate layer.3. The membrane of in which the film inter-penetrates the substrate fabric to a depth of at least 1 micron.4. The membrane of in which the film inter-penetrates the substrate fabric at least at one point to a depth of at least 10% of the thickness of the substrate layer.5. The membrane of in which the film inter-penetrates the substrate fabric at least one point to a depth of at least 2 layers of nanofibers of the substrate layer.6. The membrane of in which the polymeric porous film has a total thickness of 200 microns or less claim 1 , wherein the total thickness does not include any portion of the film that inter penetrates the substrate layer.7. The membrane of claim 1 , wherein the pore size of the film is smaller than the pore size of the nanofiber substrate.8. The membrane of claim 1 , wherein the nanofiber substrate fabric comprises nanofibers that are spun from a polymer that further comprise a polyethersulfone claim 1 , a polysulfone claim 1 , a polymide claim 1 , a polyvinylidene fluoride claim 1 , a polytheylene terephthalate claim 1 , a polypropylene claim 1 , a polyethylene claim 1 , a polyacrylonitrile claim 1 , a polyamide claim 1 , a polyaramid or any combination of the foregoing.9. The membrane of claim ...

SEPARATION MEMBRANE, SHEET CHANNEL MATERIAL, AND SEPARATION MEMBRANE ELEMENT

The present invention provides a separation membrane and a separation membrane element capable of exhibiting a good water production performance even at a high temperature and also excellent handleability and quality. The separation membrane of the present invention includes a separation membrane main body having a feed-side face and a permeate-side face; and a permeate-side channel member fixed onto the permeate-side face of the separation membrane main body, and the permeate-side channel member includes polypropylene as a main component and satisfies the following requirements (a) to (c): (a) a softening point temperature is 60° C. or higher; (b) a tensile elongation in a standard state is 10% or more; and (c) a yield point stress under a wet condition at 50° C. is 2 MPa or more. 113-. (canceled)14. A separation membrane comprising: a separation membrane main body having a feed-side face and a permeate-side face; and a permeate-side channel member fixed onto the permeate-side face of the separation membrane main body ,wherein the permeate-side channel member comprises polypropylene as a main component and satisfies the following requirements (a) to (c):(a) a softening point temperature is 60° C. or higher;(b) a tensile elongation in a standard state is 10% or more; and(c) a yield point stress under a wet condition at 50° C. is 2 MPa or more.15. The separation membrane according to claim 14 , wherein a composition constituting the permeate-side channel member satisfies the following requirement (d) or (e):(d) a crystallization peak temperature of the composition as measured with a differential scanning calorimeter (DSC) is 30° C. or higher; or(e) in a case where an exothermic peak based on crystallization cannot be confirmed with DSC, a half-crystallization time at 30° C. is 10 minutes or less.16. The separation membrane according to claim 14 , wherein the separation membrane main body comprises a substrate claim 14 , a porous supporting layer formed on the ...

PREPARATION, REGENERATION AND APPLICATION OF A CHELATING MICROFILTRATION MEMBRANE

A polyvinylidene fluoride (PVDF) casting membrane solution is shaped as a flat sheet membrane by thermally induced phase separation (TIPS), the PVDF membrane is defluorinated with an alkaline potassium permanganate solution, and then the carbon chain is extended with glycidyl methacrylate (GMA) as the graft monomer, and finally the nucleophilic substitution is carried out between melamine and GMA to produce a chelating microfiltration membrane for capturing and enriching heavy metals with high flux and high capacity. 1. A preparation method of a chelating microfiltration membrane , comprising:A. preparing a polyvinylidene fluoride flat sheet membrane: adding 70-90 parts of a solvent into a reactor, then adding 4-22 parts of pore-forming agent and 6-16 parts of polyvinylidene fluoride, then dissolving completely to form a casting membrane solution; stirring and reacting the casting membrane solution for 1-44 h in the reactor, wherein the reaction temperature is controlled at 50-100° C.; wherein the casting membrane solution, after being settled and defoamed, is shaped as a diaphragm by employing a thermally induced phase separation process; soaking the diaphragm in distilled water for 1-3 h, and finally drying to produce a polyvinylidene fluoride PVDF flat sheet membrane;B. defluorination: adding the polyvinylidene fluoride flat sheet membrane obtained in step A and a low concentration alkaline potassium permanganate solution to the reactor, wherein a mass ratio of the flat sheet membrane and the alkaline potassium permanganate solution is 1:20-1:50, with a temperature controlled at 10-100° C., performing the reaction for 1-25 h, and then washing and drying to obtain a defluorinated flat sheet membrane;C. grafting glycidyl methacrylate: adding the deflourinated flat sheet membrane step B and a solution of glycidyl methacrylate at a concentration of 0.5-5% to the reactor, wherein a mass ratio of the deflourinated flat sheet membrane and the solution is 1:20-1:50, then ...

FORMED SHEET MEMBRANE ELEMENT AND FILTRATION SYSTEM

A piece of substrate material is formed under heat and pressure by a roller against a cavity or platen into a shaped substrate sheet having one or more depressions. Two substrate sheets are bonded together to form a substrate wherein the one or more depressions form one or more interior channels. The substrate is coated with a dope in a casting device having a guide portion corresponding to the shape of the substrate sheets and quenched to form a filtering membrane. 1. A process for coating a permeate sheet having protrusions formed on the permeate sheet , the process comprising the steps of ,a) locating the permeate sheet relative to a coating knife, the coating knife having a pattern corresponding to the permeate sheet;b) providing generally equal amounts of a dope simultaneously to both sides of the permeate sheet; and,c) drawing the permeate sheet through the coating knife at a controlled speed.2. The process of wherein the permeate sheet is drawn through the coating knife at a generally constant speed and the flow of dope is at a generally constant rate.3. The process of wherein the permeate sheet is drawn from the coating knife through an air gap to a bath and the length of the air gap is selected to give a desired residence time at the constant speed.4. The process of comprising forming two embossed sheets and bonding the embossed sheets together to form the permeate sheet.5. The process of wherein the embossed sheets are sheets of non-woven fabric.6. The process of wherein the embossed sheets are formed by a process including heating them to above a heat deflection temperature of the embossed sheets.7. The process of comprising passing the permeate sheet through a coating device claim 1 , wherein the coating device defines a slot adapted to receive the permeate sheet claim 1 , the coating device comprising a guide section configured to engage the protrusions claim 1 , one or more dope outlets and a coating knife.8. The process of wherein the coating device ...

ANION EXCHANGE MEMBRANES, METHODS OF PREPARATION AND USES THEREOF

The present invention provides anion exchange membranes, processes for producing same and uses thereof. The anion exchange membranes according to embodiments of the present invention achieve a desirable combination of low resistance, high permselectivity and low degree of dimensional swelling. Anion exchange membranes according to embodiments of the present invention are also cost effective. 1. An anion exchange membrane comprising:i) a first aromatic polymer comprising cationic groups bound to an aromatic backbone of the first aromatic polymer through alkyl groups; andii) a second aromatic polymer comprising aromatic amino groups;wherein the first aromatic polymer and the second aromatic polymer are crosslinked through an alkyl bridge between an aromatic ring of the aromatic backbone of the first polymer and an amine of the second polymer.2. The anion exchange membrane of claim 1 , wherein the first aromatic polymer comprising cationic groups is based on a polymer selected from the group consisting of alkylated polyphenylene oxide claim 1 , alkylated polyphenylsulfone claim 1 , polysulfone based on bisphenol A claim 1 , alkylated polyethersulfone claim 1 , alkylated polyaromatic ether ketone and aromatic alkylated polystyrene claim 1 ,3. The anion exchange membrane of claim 2 , wherein the first aromatic polymer comprising cationic groups is based on alkylated polyphenylene oxide.4. The anion exchange membrane of claim 3 , wherein the alkylated polyphenylene oxide is methylated polyphenylene oxide.5. The anion exchange membrane of claim 4 , wherein the methylated polyphenylene oxide is 2 claim 4 , 6 claim 4 , dimethyl polyphenylene oxide.6. The anion exchange membrane of claim 1 , wherein the alkyl group of the first aromatic polymer comprising cationic groups claim 1 , the alkyl bridge claim 1 , or both claim 1 , are a short-chain alkyl containing 1 to 6 methylene groups.7. The anion exchange membrane of claim 6 , wherein the alkyl group of the first aromatic ...

Polysulfone-Urethane Copolymer, Membranes And Products Incorporating Same, And Methods For Making And Using Same

A polysulfone-urethane copolymer is disclosed, which can be used as a membrane polymer, e.g., a matrix polymer, a pore forming agent, or both, while enhancing a membrane's blood compatibility. Methods are disclosed for forming the copolymer and incorporating the copolymer in membranes (e.g., spun hollow fibers, flat membranes) and other products. 120-. (canceled)21. A method for preparing a polysulfone-urethane copolymer , comprising1) reacting an aromatic diol and a dihalodiphenyl sulfone to form a polysulfone block, and control the stoichiometry so that the polysulfone block has dihalodiphenyl end groups,2) reacting at least one oligo- or polyurethane block with an aromatic dihydroxyl compound which end caps the at least one oligo- or polyurethane block to form an encapped oligo- or polyurethane block, and3) reacting the polysulfone block and the end-capped oligo- or polyurethane block to form the polysulfone-urethane copolymer.22. The method of claim 21 , wherein said step 1) and said step 2) are conducted in the presence of at least one metal carbonate and at least one solvent.23. The method of claim 22 , wherein said metal carbonate is dipotassium carbonate and said solvent is a polar aprotic solvent.24. The method of claim 21 , wherein said polysulfone block having said dihalodiphenyl end groups comprises repeating units of an aromatic dihydroxyl compound and a dihalodiphenyl sulfone and a dihalodiphenyl sulfone end groups.25. The method of claim 21 , wherein said reacting in said step 1) is in the presence of a metal carbonate as a catalyst at a reaction temperature of from about 145° C. to about 185° C. for about 2 hours to about 12 hours in a reaction vessel setup with a fractionation column.26. The method of claim 21 , wherein said step 2) is maintained at a reaction temperature of 65° C.±5° C. at atmospheric pressure for at least 2 hours or until no change is seen in the amount of NCO end groups.27. The method of claim 21 , wherein in said step 3) claim ...

ENHANCED GRAPHENE OXIDE MEMBRANES AND METHODS FOR MAKING SAME

A method for making a graphene oxide membrane and a resulting free-standing graphene oxide membrane that provides desired qualities of water permeability and selectivity at larger sizes, thinner cross sections, and with increased ruggedness as compared to existing membranes and processes. 1. A method for making a graphene oxide membrane , comprising the step of:casting a gel dispersion comprising graphene oxide (GO) flakes having an average diameter greater than or equal to about 100 micrometers at a substantially neutral pH onto a receiving surface.2. The method of claim 1 , further including the step of air drying the gel dispersion on the receiving surface to form the membrane.3. The method of claim 1 , wherein the gel dispersion includes a pH selected from about 5 to about 7.5.4. The method of claim 1 , wherein the graphene oxide (GO) flakes in the gel has a concentration between about 1% to about 3% by weight.5. The method of claim 1 , wherein the gel dispersion is formed by a process including placing a graphite solid with a particle size greater than about 150 micrometers into a concentrated acid solution without sonicating or stirring the graphite for a time sufficient to form a quantity of graphite oxide.6. The method of claim 5 , further comprising the step of adding KMnOpowder to the concentrated acid solution to form individual layers of graphene oxide (GO) therein.7. The method of claim 6 , further comprising the step of adding the individual layers of graphene oxide (GO) to a HO/HO solution to neutralize unreacted KMnO.8. The method of claim 7 , further including washing the individual layers of graphene oxide (GO) in the neutral solution without stirring or rotating the GO and acidifying the neutral solution to remove reduced metal as metal ions therefrom.9. The method of claim 8 , further including iteratively rinsing and centrifuging the individual layers of graphene oxide (GO) in the previously acidified solution with distilled HO to obtain a ...

Filtration Films Having Dense Packing of Pores of Uniform Size and Distribution, and Tools and Methods for Their Formation

Porous filters having uniform pore size and close packing density are described, along with methods and apparatus for making the porous filters based on nanopatterning. One method includes applying a polymeric liquid to a mold consisting of an array of posts having a desired pore size and distribution. Solidification of polymeric membrane followed by separation from the mold produces a polymer membrane with a predetermined spaced array of pores. A pre-filter film can also be bonded with the membrane during formation to provide increased mechanical support and filtration of larger particles on the input side of the filter. Other process variants are described, including methods for incorporating additional functionalities to the filter.

CHITOSAN-GRAPHENE OXIDE MEMBRANES AND PROCESS OF MAKING THE SAME

This invention relates generally to a chitosan-graphene oxide membrane and process of making the same. The nanocomposite membrane can filter water and remove contaminants without fouling like other commercially-available polymer-based water filters. The membrane can be used as a flat sheet filter or can be engineered in a spiral filtration module. The membrane is scalable and tunable for many water contaminants including pharmaceuticals, pesticides, herbicides, and other organic chemicals. The membrane uses chitosan, which is low-cost, renewable biopolymer typically considered to be a waste product and the second most abundant biopolymer on Earth, thus making the membrane an environmentally-friendly product choice. 1. A chitosan-graphene oxide composite membrane , comprising:a graphene oxide having a flake size between about 80 nm and about 105 nm in diameter, between about 0.3 μm and about 0.7 μm in diameter or a combination thereof; anda denatured chitosan.2. The membrane of wherein said membrane is a scalable chitosan-graphene oxide composite membrane.3. The membrane of wherein said membrane is a flat sheet chitosan-graphene oxide composite membrane.4. The membrane of wherein said membrane is a spiral wound chitosan-graphene oxide composite membrane.5. The membrane of comprising up to about 25% by weight graphene oxide and up to about 75% by weight denatured chitosan.6. The membrane of wherein a ratio of said chitosan to said graphene oxide is between about 4:1 and about 6:1 w/w.7. The membrane of wherein said ratio of said chitosan to said graphene oxide is about 5:1 w/w.8. A process for making a chitosan-graphene oxide composite membrane claim 6 , said process comprising the steps of:mixing graphene oxide with purified water, wherein said graphene oxide has a flake size between about 80 nm and about 105 nm in diameter, between about 0.3 μm and about 0.7 μm in diameter or a combination thereof;mixing chitosan with an acid;preparing a casting solution comprising ...

FLUOROPOLYMERS AND MEMBRANES COMPRISING FLUOROPOLYMERS (I)

Disclosed are a copolymer, porous membranes made from the copolymer, and a method of treating fluids using the porous membranes to remove metal ions, for example, from fluids originating in the microelectronics industry, wherein the copolymer includes polymerized monomeric units I and II, wherein monomeric unit I is of the formula A-X—CH—B, wherein A is Rf—(CH)n, Rf is a perfluoro alkyl group of the formula CF—(CF)—, wherein x is 3-12, n is 1-6, X is O or S, and B is vinylphenyl, the monomeric unit II is haloalkyl styrene, and optionally wherein the halo group of haloalkyl is replaced with an optional substituent, for example, ethylenediamine tetra acetic acid, iminodiacetic acid, or iminodisuccinic acid. 1. A copolymer comprising polymerized monomeric units I and II , wherein:{'sub': 2', '2', '3', '2', 'x, 'monomeric unit I is of the formula A-X—CH—B, wherein A is Rf—(CH)n, Rf is a perfluoro alkyl group of the formula CF—(CF)—, wherein x is 3-12, n is 1-6, X is O or S, and B is vinylphenyl,'}monomeric unit II is haloalkyl styrene, andoptionally wherein the halo group of haloalkyl is replaced with a substituent selected from the group consisting of alkoxy, alkylcarbonyl, hydroxyalkyl. an acidic group, a basic group, a cation, an anion, a zwitterion, hydroxyl, acyloxy, alkylthio, aldehydo, amido, carbamoyl, ureido, cyano, nitro, ethylenediamine tetra acetic acid, iminodiacetic acid, and iminodisuccinic acid.2. The copolymer of claim 1 , wherein n=2.3. The copolymer of claim 1 , wherein x=4-8.4. The copolymer of claim 1 , wherein monomeric unit II is chloroalkyl styrene.5. The copolymer of claim 1 , wherein the haloalkyl is chloromethyl.6. The copolymer of claim 1 , which is a block copolymer.7. The copolymer of claim 1 , which is a random copolymer.8. A porous membrane comprising the copolymer of claim 1 , disposed on a porous support.9. The porous membrane of claim 8 , wherein the porous support is a porous polymeric support.10. The porous membrane of claim 9 , ...

FLUOROPOLYMERS AND MEMBRANES COMPRISING FLUOROPOLYMERS (II)

Disclosed are a copolymer, porous membranes made from the copolymer, and a method of treating fluids to remove metal ions using the porous membranes, for example, from fluids originating in the microelectronics industry, wherein the copolymer includes monomeric units I and II, wherein monomeric unit I is of the formula A-X—CH—B, wherein A is Rf—(CH)n, Rf is a perfluoro alkyl group of the formula CF—(CF)—, wherein x is 3-12, n is 1-6, X is O or S, and B is vinylphenyl, and monomeric unit II is vinylpyridine. 1. A copolymer comprising polymerized monomeric units I and II , wherein monomeric unit I is of the formula A-X—CH—B , wherein A is Rf—(CH)n , Rf is a perfluoro alkyl group of the formula CF—(CF)— , wherein x is 3-12 , n is 1-6 , X is O or S , and B is vinylphenyl , and monomeric unit II is vinylpyridine.2. The copolymer of claim 1 , wherein n=2.3. The copolymer of claim 1 , wherein x=4-8.4. The copolymer of claim 1 , wherein the vinylpyridine is 4-vinyl pyridine.5. The copolymer of claim 1 , which is a block copolymer.6. The copolymer of claim 1 , which is a random copolymer.7. A porous membrane comprising the copolymer of claim 1 , disposed on a porous support.8. The porous membrane of claim 7 , wherein the porous support is a porous polymeric support.9. The porous membrane of claim 8 , wherein the porous polymeric support is selected from PVC/PAN claim 8 , polysulfone claim 8 , polyethersulfone claim 8 , HDPE claim 8 , PET claim 8 , PPS claim 8 , PPSU (polyphenyl sulfone) claim 8 , PTFE claim 8 , PVDF claim 8 , PVF (polyvinyl fluoride) claim 8 , PCTFE (polychlorotrifluoroethylene) claim 8 , FEP (fluorinated ethylene-propylene) claim 8 , ETFE (polyethylenetetrafluoroethylene) claim 8 , ECTFE (poly ethylenechlorotrifluoroethylene) claim 8 , PFPE (perfluoropolyether) claim 8 , PFSA (perfluorosulfonic acid) claim 8 , and perfluoropolyoxetane.10. A method of preparing a porous membrane comprising a copolymer claim 8 ,{'sub': 2', '2', '3', '2', 'x, 'wherein the ...

CO-CASTING ULTRAFILTRATION MEMBRANES WITH DISORDERED BLOCK POLYMER SELECTIVE LAYERS

Forming a dual layer filtration membrane includes disposing a first solution with a homopolymer and a first solvent on a substrate to yield a homopolymer layer on the substrate; disposing a second solution with a block polymer and a second solvent on the homopolymer layer to yield a dual layer liquid film having a block polymer layer on the homopolymer layer; disordering the block polymer layer to yield a disordered block polymer layer; vitrifying the disordered block polymer of the disordered block polymer layer and inducing phase separation and vitrification of the homopolymer of the homopolymer layer; and creating pores in the disordered block polymer layer to yield the dual layer filtration membrane having a porous disordered block polymer layer. 1. A method of forming a dual layer filtration membrane , the method comprising:disposing a first solution comprising a homopolymer and a first solvent on a substrate to yield a homopolymer layer on the substrate;disposing a second solution comprising a block polymer and a second solvent on the homopolymer layer to yield a dual layer liquid film comprising a block polymer layer on the homopolymer layer;disordering the block polymer layer to yield a disordered block polymer layer;vitrifying the disordered block polymer of the disordered block polymer layer and inducing phase separation and vitrification of the homopolymer of the homopolymer layer; andcreating pores in the disordered block polymer layer to yield the dual layer filtration membrane comprising a porous disordered block polymer layer.2. The method of claim 1 , wherein a concentration (wt %) of the homopolymer in the first solution exceeds a concentration (wt %) of the block polymer in the second solution.3. The method of claim 2 , wherein a concentration (wt %) of the homopolymer in the first solution exceeds a concentration (wt %) of the block polymer in the second solution by at least a factor of ten.4. The method of claim 1 , wherein a volatility of the ...

METHOD FOR PRODUCING PBI FILMS WITHOUT ORGANIC SOLVENTS

A novel process for making PBI films starting from gel PBI membranes polymerized and casted in the PPA process wherein acid-imbibed gel PBIs are neutralized in a series of water baths and undergo controlled drying in association with a substrate material, yielding a PBI film without the use of organic solvents. 1. A process for forming a polybenzimidazole (PBI) film comprising:polymerizing an aromatic or heteroaromatic tetraamino compound with at least one aromatic or heteroaromatic polycarboxylic acid or ester, anhydride, or acid chloride thereof or at least one aromatic or heteroaromatic diaminocarboxylic acid in the presence of a polyphosphoric acid solvent to form a PBI polymer solution that includes the PBI polymer in solution with the polyphosphoric acid solvent;processing the PBI polymer solution to form a membrane precursor;hydrolyzing at least a portion of the polyphosphoric acid to form phosphoric acid and water, thereby causing a sol-gel transfer of the PBI polymer solution and solidification of the PBI polymer to form a PBI gel membrane;rinsing the PBI gel membrane and thereby removing the phosphoric acid from the gel membrane;drying the rinsed PBI gel membrane as it is restrained on a porous substrate and thereby forming the PBI film.2. The process of claim 1 , wherein the PBI gel membrane is rinsed in a series of washes.3. The process of claim 1 , wherein the rinsed PBI gel membrane is dried as it is restrained between the porous substrate and a second substrate.4. The process of claim 1 , wherein the second substrate is porous.5. The process of claim 1 , wherein the process is a continuous process.6. The process of claim 1 , further comprising imbibing the PBI file with an electrolyte.7. The process of claim 6 , wherein the electrolyte comprises sulfuric acid.8. The process of claim 1 , wherein the polymerization is carried out at a temperature of about 220° C. or less.9. The process of claim 1 , wherein the PBI polymer solution exhibits an intrinsic ...

Filtration membranes and related compositions, methods and systems

Described herein are filtration membranes and related, compositions, methods and systems and in particular filtration membranes with embedded polymeric micro/nanoparticles and related compositions, methods, and systems.

NANOCOMPOSITE ULTRA-THIN SEPARATION MEMBRANE AND METHOD FOR MANUFACTURING THE SAME

The present invention relates to a nanocomposite ultra-thin separation membrane and a method for manufacturing the same, wherein the nanocomposite ultra-thin separation membrane for seawater desalination according to the present invention includes: 1) a polyamide-based polymer active layer; 2) a polyethersulfone support membrane; 3) an external support body; and 4) carbon nanotube, to remarkably improve hydrophilicity of the porous support membrane, thereby having more than doubled water permeability of the entire separation film. In addition, due to a physiochemical reaction of the functionalized carbon nanotube, a support membrane exposed to air for a long period of time is also usable as a lower body of the ultra-thin separation membrane. 1. A nanocomposite ultra-thin separation membrane comprising:(a) a support body layer;(b) a support membrane layer formed on the support body; and(c) an active layer formed on the support membrane,wherein a functionalized carbon-nanotube is included only in the support membrane layer among the support body layer, the support membrane layer, and the active layer.2. The nanocomposite ultra-thin separation membrane of claim 1 , wherein the support body is selected from polyethylene terephthalate (PET) claim 1 , polypropylene (PP) claim 1 , cellulose acetate (CA) claim 1 , a blend of two or more thereof claim 1 , and a copolymer of two or more thereof;the support membrane is a polyethersulfone (PES)-based polymer;the active layer is a polyamide (PAm)-based polymer; andthe carbon nanotube is a multi-walled carbon nanotube.3. A method for manufacturing a nanocomposite ultra-thin separation membrane claim 1 , the method comprising:(A) obtaining a dispersion for forming a support membrane, the dispersion including a support membrane polymer, a functionalized carbon nanotube, a pore-forming additive, and a dispersion medium;(B) using the dispersion for forming a support membrane to form a support membrane layer on a support body by a ...

POLYETHERSULFONE FILTRATION MEMBRANE

Provided herein are filtration membranes, method of manufacturing said membranes and use of such membranes for the removal of substances from fluids or substances. 1. A method of manufacturing a filtration membrane , the method comprising: (i) providing a solution comprising: (a) a polymer selected from the group consisting of polyethersulfone (PES) , polysulfone , and any combinations thereof; and (b) a dopant selected from the group consisting of a phosphate salt , a sulfate anion , a chloride anion , a fluoride anion , nanoclay , and any combination thereof; and (ii) casting the solution to form a film or membrane.242-. (canceled) This application claims benefit under 35 U.S.C. §119(e) of the U.S. Provisional Application No. 61/614,164, filed Mar. 22, 2012, the content of which is incorporated herein by reference in its entirety.The present invention is directed to improved filtration membranes. Furthermore, the disclosure is directed to a method of manufacturing filtration membranes and use of such membranes for the removal of substances from fluids or substances.Since its inception, membrane technology has played an important role towards improving the performance of a large number of industrial processes. Membranes may be considered one of the most versatile separation technologies available today as they may be successfully adapted for a wide range of applications involving solid/liquid, gas/gas, gas/liquid, and liquid/liquid separation processes. See for example, O. O Hart, R. C. Squires, The role of membrane technology in industrial water and wastewater treatment, Desalination, 56 (1985) 69-87; Y. Lee, S. Ahmed, Membrane technologies: Industry trends and applications, Membrane Technology, 98 (1998) 11-12; Ann-Sofi Jönsson, Gun Trägardh, Ultrafiltration applications, Desalination, 77 (1990) 135-179; and E. Drioli, E. Fontananova, Membrane technology and sustainable growth, Chemical Engineering Research and Design, 82(A12-2004) 1557-1562. One such application ...

Polyaniline-Based Chlorine Resistant Hydrophilic Filtration Membranes

In one aspect, the invention relates to chlorine-resistant filtration membranes comprising n-alkyl substituted polyaniline derivatives for use in, for example, water purification, and methods for making and using same. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention. 2. The membrane of claim 1 , wherein the membrane further comprises a support structure.3. The membrane of claim 1 , wherein the membrane further comprises a second polymer selected from polysulfone claim 1 , sulfonated polysulfone claim 1 , polyethersulfone claim 1 , sulfonated polyethersulfone claim 1 , polyaniline claim 1 , polyaniline co-polymers claim 1 , polyacrylonitrile claim 1 , polyurethane claim 1 , cellulose acetate claim 1 , polyvinylidene fluoride claim 1 , polytetrafluoroethylene claim 1 , polyvinyl fluoride claim 1 , polyvinylidene fluoride claim 1 , polytrifluoroethylene claim 1 , polyperfluoroalkyl vinyl ether claim 1 , polyhexafluoropropylene claim 1 , cellulose acetate claim 1 , polyurethane claim 1 , cellulose acetate claim 1 , and polyurethane claim 1 , or a mixture thereof.4. The membrane of claim 1 , wherein the membrane further comprises polysulfone.5. The membrane of claim 1 , wherein the polymer is present in an amount from about 0.1 wt % to about 35 wt %.6. (canceled)7. (canceled)9. The polymer of claim 8 , wherein n is 2.10. The polymer of claim 8 , wherein each of R claim 8 , R claim 8 , R claim 8 , and Rare hydrogen.11. The polymer of claim 8 , wherein each of Rand Rare hydrogen.12. The polymer of claim 8 , wherein each of Rand Ris hydrogen claim 8 , and Ris —OR.13. The polymer of claim 8 , wherein each of R claim 8 , R claim 8 , R claim 8 , and R claim 8 , when present claim 8 , are hydrogen.14. The polymer of claim 8 , wherein each of Rand R claim 8 , when present claim 8 , are OR.15. The polymer of claim 8 , wherein R claim 8 , when present claim 8 , is hydrogen.17. ...

HIGH SELECTIVITY COPOLYIMIDE MEMBRANES FOR SEPARATIONS

The present invention discloses high selectivity copolyimide membranes for gas, vapor, and liquid separations. Gas permeation tests on these copolyimide membranes demonstrated that they not only showed high selectivity for CO/CHseparation, but also showed extremely high selectivities for H/CHand He/CHseparations. These copolyimide membranes can be used for a wide range of gas, vapor, and liquid separations such as separations of CO/CH, He/CH, CO/N, olefin/paraffin separations (e.g. propylene/propane separation), H/CH, He/CH, O/N, iso/normal paraffins, polar molecules such as HO, HS, and NHmixtures with CH, N, H. The high selectivity copolyimide membranes have UV cross-linkable sulfonyl functional groups and can be used for the preparation of UV cross-linked high selectivity copolyimide membranes with enhanced selectivities. The invention also includes blend polymer membranes comprising the high selectivity copolyimide and polyethersulfone. The blend polymer membranes comprising the high selectivity copolyimide and polyethersulfone can be further UV cross-linked under UV radiation. 2. The copolyimide membrane of wherein said copolyimide polymer has a weight average molecular weight in a range of 50 claim 1 ,000 to 1 claim 1 ,000 claim 1 ,000 Daltons.3. The copolyimide membrane of wherein said copolyimide polymer is selected from the group consisting of poly(3 claim 1 ,3′ claim 1 ,4 claim 1 ,4′-diphenylsulfone tetracarboxylic dianhydride-3 claim 1 ,3′ claim 1 ,5 claim 1 ,5′-tetramethyl-4 claim 1 ,4′-methylene dianiline-3 claim 1 ,3′-diaminodiphenyl sulfone) copolyimide (TD-PI-3-2) claim 1 , poly(3 claim 1 ,3′ claim 1 ,4 claim 1 ,4′-diphenylsulfone tetracarboxylic dianhydride-2 claim 1 ,4 claim 1 ,6-trimethyl-m-phenylenediamine-3 claim 1 ,3′-diaminodiphenyl sulfone) copolyimide (TPD-PI-3-2) claim 1 , poly(3 claim 1 ,3′ claim 1 ,4 claim 1 ,4′-diphenylsulfone tetracarboxylic dianhydride-2 claim 1 ,4 claim 1 ,6-trimethyl-1 claim 1 ,3-phenylenediamine-3 claim 1 ,3′- ...

CHEMICALLY AND UV CROSS-LINKED HIGH SELECTIVITY POLYIMIDE MEMBRANES FOR GAS SEPARATIONS

This invention discloses a membrane composition, a method of making, and applications for a new type of high selectivity, high plasticization-resistant and solvent-resistant, both chemically and UV cross-linked polyimide membranes. Gas permeation tests on these membranes demonstrated that they not only showed high selectivities, but also showed extremely high COplasticization resistance under COpressure up to 4923 kPa (700 psig). This new type of high selectivity, high plasticization-resistant and solvent-resistant, both chemically and UV cross-linked polyimide membranes can be used for a wide range of gas separations such as separations of H/CH, He/CH, CO/CH, CO/N, olefin/paraffin separations (e.g. propylene/propane separation), O/N, iso/normal paraffins, polar molecules such as HO, HS, and NHmixtures with CH, N, H, and other light gases separations. The membranes can also be used for liquid separations such as in the removal of organic compounds from water. 5. A polyimide polymer membrane comprising the polyimide polymer of .6. The polyimide polymer membrane of is chemically and UV cross-linked.7. The polyimide polymer membrane of comprising a thin nonporous selective separation layer formed from the polyimide polymer with a plurality of repeating units of formula (I) and a porous nonselective mechanical support layer made from a material different from the polyimide polymer with a plurality of repeating units of formula (I).8. The polyimide polymer membrane of wherein said thin nonporous selective separation layer formed from the polyimide polymer with a plurality of repeating units of formula (I) is chemically and UV cross-linked.9. The polyimide polymer membrane of wherein said material different from the polyimide polymer with a plurality of repeating units of formula (I) is selected from the group consisting of polysulfones claim 7 , sulfonated polysulfones claim 7 , polyethersulfones (PESs) claim 7 , sulfonated PESs claim 7 , polyethers claim 7 , ...

Superhydrophobic Polypropylene Porous Film, Preparation Method Therefor, and Method for Improving Hydrophobicity of Polypropylene Porous Film

A superhydrophobic polypropylene porous film, including a polypropylene porous film substrate, titanium dioxide layers and a surface modifier layer, is disclosed. The titanium dioxide layers are deposited on the surface of the polypropylene porous film substrate by atomic deposition technology; a surface modifier is coated on the titanium dioxide layers; hydrophobic bonds are formed between the titanium dioxide layers and the surface modifier layer; the superhydrophobic polypropylene porous film has a water contact angle greater than 150 degrees, a rolling angle less than 10 degrees, an aperture of 0.1-0.4 μm, a porosity of 50%-80%, a tensile strength of 30-50 MPa, and an elongation at break of 10%-30%. The superhydrophobic polypropylene porous film maintains the chemical resistance, rigidity, and porosity of the polypropylene porous film, and has superhydrophobic properties and a good separation effect after working for 80 hours, thus greatly increasing the service life, and reducing operation costs and working costs in a membrane distillation process. 1. A method of preparing a super-hydrophobic polypropylene porous film , comprising , in sequence , depositing titanium dioxide layers on a surface of a polypropylene porous film substrate by atomic deposition technology , spraying a surface modifier comprising a nano silicon emulsion on the titanium dioxide layers to obtain a polypropylene porous film with the titanium dioxide layers and the surface modifier layer thereon , and illuminating , rinsing and drying the polypropylene porous film with the titanium dioxide layers and the surface modifier layer thereon to form a hydrophobic bond between the titanium dioxide layers and the surface modifier layer to obtain the superhydrophobic polypropylene porous film , wherein the superhydrophobic polypropylene porous film has a water contact angle greater than 150° , a rolling angle less than 10° , a pore size of 0.1 μm to 0.4 μm , a porosity of 50% to 80% , a tensile ...

LIQUID FILTERING STRUCTURE

A liquid filtering structure having high filtering efficiency, excellent transparency, and excellent durability can be provided. The liquid filtering structure includes a filtering layer, wherein the filtering layer includes a nanopore structure unit including a plurality of nanopores and a functional group-containing compound including functional groups at one end, and has selectivity with respect to liquid molecules to be filtered, for example, water molecules, and effectively filter liquid, particularly water by preventing ions or compounds from being passed. 1. A liquid filtering structure comprising a filtering layer , the filtering layer comprising:a nanopore structure unit comprising a plurality of nanopores; anda functional group-containing compound comprising functional groups at one end,wherein the nanopores penetrate the filtering layer in a thickness direction of the filtering layer and have an average diameter of 0.2 nm to 20 nm, andthe functional group-containing compound is chemically combined with internal walls of the nanopores.2. The liquid filtering structure of claim 1 , wherein the nanopore has a bottleneck shape or a tapered shape in the thickness direction of the filtering layer.3. The liquid filtering structure of claim 2 , wherein the nanopore has a minimum diameter of 10 nm or less.4. The liquid filtering structure of claim 1 , wherein the nanopore structure unit is made of one or more types of materials selected from a polymer claim 1 , a copolymer claim 1 , an organic compound claim 1 , an inorganic compound claim 1 , a metal compound claim 1 , and a carbon compound.5. The liquid filtering structure of claim 4 , wherein the copolymer comprises one or more types selected from PS-b-PAA claim 4 , PS-b-PEO claim 4 , PS-b-PLA claim 4 , PS-b-PMMA claim 4 , PS-b-PB claim 4 , and PS-b-PVP.6. The liquid filtering structure of claim 1 , wherein at least part of the filtering layer has a thickness of 100 nm or less.7. The liquid filtering structure ...

Composition and method for manufacturing sulfone polymer membrane

The invention pertains to a polyaryl ether sulfone polymer solution [solution (SP)] comprising: —at least one sulfone polymer [polymer (PSI)] having recurring units, wherein more than 50% moles, with respect to all the recurring units of polymer (PSI), are recurring units (R PSI ) selected from the group consisting of those of formulae (R PSI -1) and (R PSI -2) herein below: (R PSI -1) (R PSI -2) wherein: —each of E′, equal to or different from each other and at each occurrence, is selected from the group consisting of those of formulae (E′-1) to (E′-3): (E′-I) (E′-II) (E′-III) —each R′ is independently selected from the group consisting of halogen, alkyl, alkenyl, alkynyl, aryl, ether, thioether, carboxylic acid, ester, amide, imide, alkali or alkaline earth metal sulfonate, alkyl sulfonate, alkali or alkaline earth metal phosphonate, alkyl phosphonate, amine and quaternary ammonium; and —j′ is zero or an integer of 1 to 4; is a bond or a divalent group optionally comprising one or more than one heteroatom; preferably T is selected from the group consisting of a bond, —CH 2 —, —C(O)—, —C(CH 3 ) 2 —, —C(CF 3 ) 2 —, —C(═CCI 2 )—, —C(CH 3 )(CH 2 CH 2 —COOH)—, and a group of formula: (A) —at least one polar organic solvent [solvent (S)]; and —at least one mixture of polyhydroxyl aliphatic alcohols having from 1 to 6 carbon atoms or derivatives thereof [mixture (PHA)], said mixture (PHA) comprising at least one ethylene glycol compound [compound (EthyGly)] and at least one glycerol compound [compound (Gly)], to its use for manufacturing membranes, and to membranes obtained therefrom.

Forward osmosis-based separation membrane based on multilayer thin film, using crosslinking between organic monomers, and preparation method therefor

The present invention relates to a forward osmosis-based separation membrane based on a multilayer thin film, using crosslinking between organic monomers, and a preparation method therefore, and in the preparation of the forward osmosis-based separation membrane including a support layer and a selective layer, a middle layer is provided between the support layer and the selective layer so as to prevent a phenomenon in which the selective layer is filled in a pore of the support layer, such that the thickness of a multilayer thin film constituting the selective layer is optimized, and excellent water permeability, salt removal rate and pollution resistance properties are exhibited through the support layer having a structure of uniform surface pores and minimized pore distortion.

METHOD OF PREPARING HYBRID MEMBRANE

A method of preparing a hybrid membrane, the method including: evenly mixing a granular material and a dispersant, to yield a dispersion solution; evenly mixing a polymer and an organic solvent, to yield a matrix solution; adding the matrix solution to the dispersion solution to yield a mixed solution; heating the mixed solution to remove the dispersant, to yield a casting solution; and coating the casting solution on a substrate, followed by removal of the organic solvent, to yield a hybrid membrane. 1. A method , comprising:1) evenly mixing a granular material and a dispersant, to yield a dispersion solution;2) evenly mixing a polymer and an organic solvent, to yield a matrix solution; adding the matrix solution to the dispersion solution to yield a mixed solution;3) heating the mixed solution obtained in (2) to remove the dispersant, to yield a casting solution; and4) coating the casting solution on a substrate, followed by removal of the organic solvent, to yield a hybrid membrane.2. The method of claim 1 , wherein the granular material is a micron or nanoscale adsorbent or catalyst claim 1 , selected from metal-organic frameworks claim 1 , metal hydroxides claim 1 , metal oxides claim 1 , metals claim 1 , graphene oxides claim 1 , and graphene; and the produced hybrid membrane comprises 1-80 wt. % of the granular material.3. The method of claim 1 , wherein the dispersant is selected from the group consisting of acetone claim 1 , methanol claim 1 , ethanol claim 1 , and surfactants.4. The method of claim 1 , wherein the polymer is selected from the group consisting of polyvinylidene fluoride claim 1 , polytetrafluoroethylene claim 1 , cellulose diacetate claim 1 , cellulose triacetate claim 1 , mixed cellulose claim 1 , polysulfone claim 1 , sulfonated polysulfone claim 1 , polyethersulfone claim 1 , polypropylene claim 1 , polyacrylonitrile claim 1 , polyvinyl chloride claim 1 , polysulfonyl claim 1 , amine polyether ketone claim 1 , polyaliphatic amide claim 1 ...

High selectivity facilitated transport membrane comprising polyethersulfone/polyethylene oxide-polysilsesquioxane blend membrane for olefin/paraffin separations

This invention provides a new high selectivity stable facilitated transport membrane comprising a polyethersulfone (PES)/polyethylene oxide-polysilsesquioxane (PEO-Si) blend support membrane, a hydrophilic polymer inside the pores on the skin layer surface of the PES/PEO-Si blend support membrane; a hydrophilic polymer coated on the skin layer surface of the PES/PEO-Si blend support membrane, and metal salts incorporated in the hydrophilic polymer coating layer and the skin layer surface pores of the PES/PEO-Si blend support membrane, and methods of making such membranes. This invention also provides a method of using the high selectivity stable facilitated transport membrane comprising PES/PEO-Si blend support membrane for olefin/paraffin separations such as propylene/propane and ethylene/ethane separations.

CROSSLINKED POLYMERIC BLENDED MEMBRANES FOR GAS SEPARATION

Methods of making a gas separation membrane, a gas separation membrane, and method of gas separation. The gas separation membrane includes cross-linked poly(ether-b-amide) copolymer, in which the poly(ether-b-amide) copolymer comprise urethane crosslinks which is the reaction product of poly(ether-b-amide) copolymer and diisocyanate polyether according to formula (I): 2. The method of making a gas separation membrane of claim 1 , in which the poly(ether-b-amide) copolymer comprises a 25 to 80% by weight polyether segment and a 75 to 20% by weight polyamide segment.3. The method of making a gas separation membrane of claim 1 , in which Ris methyl or —H.4. The method of making a gas separation membrane of claim 1 , in which Rand Rare −C═N═O; and Rand Rare methyl.5. The method of making a gas separation membrane of claim 1 , in which the polymer solution comprises 1 to 99 weight percent of poly(ether-b-amide) copolymer.6. The method of making a gas separation membrane of claim 1 , in which the cros slinking solution comprises 2 to 40 weight percent of the crosslinker according to formula (I).7. The method of making a gas separation membrane of claim 1 , in which the cros slinking solution had a temperature of from 35 to 85° C.8. The method of making a gas separation membrane of claim 1 , in which the gas separation membrane was dried at a temperature of from 35 to 90° C.10. (canceled)12. The gas separation membrane according to claim 11 , in which the gas separation membrane further comprises a thickness of from 30 to 70 micrometers (μm).13. The gas separation membrane according to claim 11 , in which Ris methyl or —H.14. The gas separation membrane according to claim 11 , in which Rand Rare —C═N═O; and Rand Rare methyl.15. The gas separation membrane according to claim 11 , in which the gas separation membrane further comprises 1 to 99% by weight of poly(ether-b-amide) copolymer.16. The gas separation membrane according to claim 11 , in which the gas separation ...

Efficient antifouling and hydrophilic polyethersulfone ultrafiltration membrane and preparation method thereof

A preparation method of an antifouling and hydrophilic polyethersulfone ultrafiltration membrane includes through the Co-γ radiation grafting chemical modification method, evenly distributing an ionic liquid on a surface of a polyethersulfone material, wherein the ionic liquid containing unsaturated bonds is connected with the polyethersulfone material through chemical bonds, and then obtaining an asymmetric porous membrane by the immersion-precipitation phase transformation method, and finally performing Soxhlet extraction on the porous membrane, so as to migrate the grafted ionic liquid from an interior of the porous membrane to a surface of the porous membrane to be enriched, so that the adsorption and antibacterial properties of the porous membrane are improved. A mass ratio of the ionic liquid to the polyethersulfone material is in a range of (2-11):100. The ultrafiltration membrane is an asymmetric porous membrane, and has excellent antifouling properties, good pure water flux and a good BSA retention rate. 1. A preparation method of an efficient antifouling and hydrophilic polyethersulfone (PES) ultrafiltration membrane , the preparation method comprising steps of:(1) obtaining a mixed solution by mixing a PES solution with an ionic liquid (IL) and a solvent according to a mass ratio in a reactor, wherein the mass ratio of the ionic liquid to the PES solution is in a range of (2-11):100, the ionic liquid is an ionic liquid containing unsaturated bonds;(2) obtaining a mixed PES/IL blend film by casting the mixed solution, followed by removing the solvent by drying;{'sup': '60', '#text': '(3) obtaining an IL grafted PES (PES-g-IL) film by performing radiation on the mixed PES/IL blend film in a polyethylene plastic bag, wherein the radiation is Co-γ radiation at room temperature in air or nitrogen environment with a radiation dose of 30 kGy; and'}(4) preparing the PES-g-IL film into a solution, and obtaining a PES-g-IL porous membrane from the solution through ...

DEVICE FOR USE IN FLUID PURIFICATION

The present disclosure relates to a device for use in fluid purification, particularly to a membrane for use in fluid purification, the membrane comprising a porous basal layer in the form of polysulfone (PSF); a multitude of multi-walled carbon nanotubes (CNTs) dispersed within the basal layer; and a top layer in the form of polyvinyl alcohol (PVA). The disclosure extends to a method of manufacturing the device. 1. A device for use in fluid purification , the device comprising:a hydrophobic polymer layer;a multitude of carbon nanostructures dispersed within the hydrophobic polymer layer; anda hydrophilic substance at least partially coating the hydrophobic layer.2. The device according to claim 1 , wherein the device is a membrane.3. The device according to claim 1 , wherein the hydrophilic layer further comprise a cross-linker substance.4. The device according to claim 3 , wherein the cross-linker substance comprises at least one substance selected from the group consisting of: period acids claim 3 , metal salts claim 3 , any one of the Hofmeister series of salts claim 3 , aldehydes claim 3 , dialdehydes claim 3 , hydrogen together with hydroxyl radicals and carboxylic acids.5. The device according to claim 4 , wherein the cross-linker substance is maleic acid.6. The device according to claim 1 , wherein the hydrophobic polymer layer comprises at least one compound selected from the group consisting of natural or synthetic hydrophobic polymers.7. The device according to claim 6 , wherein the hydrophobic polymer is polysulfone.8. The device according to claim 1 , wherein the carbon nanostructure is at least one of the group consisting of: a carbon nanotube claim 1 , a carbon nanofibre claim 1 , a helical carbon nanotube claim 1 , and a carbon nanoball.9. The device according to claim 8 , wherein the carbon nanostructure is a multi-walled carbon nanotube.10. The device according to claim 1 , wherein the hydrophilic substance comprises at least one compound selected ...

DIALYSIS MEMBRANE AND METHOD FOR ITS PRODUCTION

A method for producing a dialysis membrane in hollow-fiber membrane or flat membrane geometry includes: a) making a casting or spinning solution for production of a base membrane for the dialysis membrane out of at least one polysulfone and at least one pore-forming hydrophilic additive in at least one organic solvent, b) bringing the casting or spinning solution into contact with a precipitating agent to form the base membrane, and c) rinsing out the at least one organic solvent after precipitation of the casting or spinning solution in flat or hollow-fiber form. 1. A method for producing a dialysis membrane in hollow-fiber membrane or flat membrane geometry , the method comprising the steps of:a) making a casting or spinning solution for production of a base membrane for the dialysis membrane out of: i.) at least one polysulfone, which is selected from the group consisting of: a polysulfone, a sulfonated polysulfone, a polyethersulfone, a sulfonated polyethersulfone, a polyphenylsulfone, a sulfonated polyphenylsulfone, and mixtures thereof; and ii.) at least one pore-forming hydrophilic additive in at least one organic solvent, selected from the group consisting of: N,N-dimethylacetamide and N-Methyl-2-pyrrolidone;b) bringing the casting or spinning solution into contact with a precipitating agent to form the base membrane; andc) rinsing out the at least one organic solvent after precipitation of the casting or spinning solution in flat or hollow-fiber form,wherein:the base membrane produced in step b) is subjected to a surface modification to create a functional surface on the base membrane by carrying out at least one layer-by-layer deposition on a surface of the base membrane so as to preserve the dialysis membrane,at least one polymeric polycationic bonding agent is applied as a first layer on the surface of the base membrane and at least one polymeric polyanion is applied on the polycationic layer as a second layer,the at least one polymeric polycationic ...

SEPARATION SUBSTRATE, CELL SEPARATION FILTER, AND METHOD FOR PRODUCING PLATELET

An object of the present invention is to provide a separation substrate having a high megakaryocyte blocking rate and a high platelet permeation rate, and a cell separation filter and a method for producing a platelet which use the same. The separation substrate of the present invention is a separation substrate including a porous membrane for separating a platelet from a cell suspension containing a megakaryocyte and the platelet, in which an average pore diameter of the separation substrate is 2.0 μm to 12.0 μm, and the separation substrate is formed of at least one resin selected from the group consisting of a polysulfone resin and a polyvinylidene fluoride resin. 1. A separation substrate comprising:a porous membrane for separating a platelet from a cell suspension containing a megakaryocyte and the platelet,wherein an average pore diameter of the separation substrate is 2.0 μm to 12.0 μm, andthe separation substrate is formed of at least one resin selected from the group consisting of a polysulfone resin and a polyvinylidene fluoride resin.2. The separation substrate according to claim 1 , wherein the separation substrate has a pore diameter distribution in which a pore diameter decreases continuously or discontinuously from a surface in a central thickness direction.3. The separation substrate according to claim 1 , wherein a surface of the separation substrate is modified with a hydrophilic polymer or a hydrophilic group.4. A cell separation filter comprising:a container in which a first liquid inlet and a second liquid inlet are disposed; and{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'a filtering medium filled between the first liquid inlet and the second liquid inlet, wherein the filtering medium is the separation substrate according to .'}5. A cell separation filter comprising:a container in which a first liquid inlet and a second liquid inlet are disposed; anda filtering medium filled between the first liquid inlet and the second liquid inlet,{' ...

Porous membranes including triblock copolymers

A porous membrane includes a triblock copolymer of the formula ABC. B is a hydrogenated vinyl aromatic block present in a range from 30 to 90 weight percent, based on the total weight of the copolymer and has a Tg of ≥110° C. C is a rubbery block present in a range from 10 to 70 weight percent, based on the total weight of the copolymer and has a Tg≤25° C. A is substantially incompatible with both the B and C blocks and is derived from ring-opening polymerization. B+C is present in a range from 70 to 95 weight percent, based on the total weight of the copolymer.

COMPOSITE MIXED MATRIX MEMBRANES FOR MEMBRANE DISTILLATION AND RELATED METHODS OF MANUFACTURE

The present invention relates to a membrane distillation system comprising a flat-sheet composite mixed matrix hydrophilic/hydrophobic membrane having at least a hydrophilic layer and a hydrophobic layer. The hydrophilic layer comprises a hydrophilic polymer and inorganic nanoparticles having high thermal conductivity. The hydrophobic layer comprises fluorinated surface-modifying macromolecules (SMM). Also disclosed is a phase inversion method for manufacturing the membrane. 1. A membrane distillation system comprising:a flat-sheet composite mixed matrix hydrophilic/hydrophobic membrane having at least a a hydrophilic layer and a hydrophobic layer;the hydrophilic layer further comprising a hydrophilic polymer and inorganic nano-particles of high thermal conductivity, andthe hydrophobic layer further comprising fluorinated surface-modifying macromolecule (SMM).2. The membrane distillation system as claimed in claim 1 , wherein said hydrophilic polymer is a thermoplastic polymer.3. The membrane distillation system as claimed in claim 2 , wherein the thermoplastic polymer is selected from the group consisting of polysulfone claim 2 , polyethersulfone claim 2 , polyetherimide and cellulose acetate.4. The membrane distillation system as claimed in claim 1 , wherein said nano-particle is an inorganic nano-particle of high thermal conductivity.5. The membrane distillation system as claimed in claim 1 , wherein said inorganic nano-particles is selected from the group consisting of copper oxide claim 1 , boron nitride claim 1 , aluminum nitride claim 1 , aluminum claim 1 , iron and silicone carbide.6. The membrane distillation system as claimed in claim 1 , wherein said fluorinated surface-modifying macromolecules (SMM) are oligomeric fluoropolymers synthesized using polyurethane chemistry claim 1 , the surface-modifying macromolecules comprise fluorinated end-groups.7. The membrane distillation system as claimed in claim 1 , wherein said fluorinated SMM is blended within ...

METHOD FOR PREPARING MEMBRANE AND ASSOCIATED MEMBRANE AND FILTER ELEMENT

The disclosure of the present invention relates to a method for preparing membrane and associated membrane and filter element. The method comprises providing a porous substrate having a plurality of pores; and applying a pre-filler solution to at least partially occupy the pores in the porous substrate. The membrane comprises a porous substrate and a filter layer formed on the porous substrate. The filter element comprises a core tube; and a membrane as prepared and rolled around the core tube. 1. A method for preparing a membrane , comprising:(1) providing a porous substrate having a mean pore size of 50-1000 microns;(2) applying a pre-filler solution to at least partially occupy the pores in the porous substrate,(3) applying a membrane solution to the porous substrate applied with the pre-filler solution, and;(4) solidifying the membrane solution to form a filter layer on the porous substrate.2. The method according to claim 1 , wherein the pre-filler solution comprises water claim 1 , organic liquids or combination thereof.3. The method according to claim 2 , wherein the organic liquids comprise alcohols claim 2 , glycerol claim 2 , ethylene glycol claim 2 , N claim 2 ,N-dimethyl formamide (DMF) claim 2 , N-methyl pyrrolidone (NMP) claim 2 , dimethyl sulfoxide (DMSO) claim 2 , dimethylacetamide (DMAc) or any combination thereof.4. The method according to claim 1 , wherein the porous substrate has an asymmetric structure claim 1 , wherein a first side thereof comprises flow channels claim 1 , and a second side thereof comprise a porous structure.5. The method according to claim 4 , wherein the pre-filler solution is applied onto the first side of porous substrate comprising flow channels; and the membrane solution is applied onto the second side of porous substrate comprising a porous structure.6. The method according to claim 4 , wherein said applying comprising spraying coating.7. The method according to claim 1 , wherein the pre-filler solution comprises a ...

FLAT SHEET MEMBRANE WITH INTEGRAL POSTS

A membrane, for example a flat sheet membrane, has posts extending from a separation layer. The posts extend through one or more supporting structures such as a substrate layer and/or a permeate carrier, between two separation layers, or both. A post may help to attach the separation layer to a supporting structure, attach two supporting structures together, strengthen a supporting structure and/or attach two separation layers together. In some examples, one or more supporting structures, which may be temporary or remain in the membrane, are made with openings for posts. A liquid containing the separating layer material is cast over the supporting structure or structures and some of the liquid flows at least part way through the openings before the liquid is solidified. A temporary supporting structure may be removed, for example dissolved. In other examples, two supporting structures are held apart in a casting knife while posts are formed.

NEW METHOD FOR PRODUCING PBI FILMS WITHOUT ORGANIC SOLVENTS

A novel process for making PBI films starting from gel PBI membranes polymerized and casted in the PPA process wherein acid-imbibed gel PBIs are neutralized in a series of water baths and undergo controlled drying in association with a substrate material, yielding a PBI film without the use of organic solvents. 1. A process for making PBI films comprising:forming a gel PBI membrane via a PPA process;rinsing the gel PBI membrane;restraining the gel PBI membrane in at least an X-Y plane direction;drying the rinsed gel PBI membrane; andwherein no organic solvent is employed throughout the process.2. The process of claim 1 , wherein the gel PBI membrane is rinsed with a wash.3. The process of claim 1 , wherein the rinsed gel PBI membrane is applied to at least one substrate.4. The process of claim 4 , wherein the rinsed gel PBI membrane is applied to a porous substrate.5. The process of claim 1 , wherein restraining the PBI membrane also places tension on the PBI membrane in an X claim 1 , Y or Z plane direction.6. The process of claim 1 , wherein a PBI film is formed via a continuous formation process.8. The process of claim 1 , wherein the process forms a film.9. The process of claim 1 , wherein the process forms a coating.10. A PBI film formed comprising:forming a gel PBI membrane via a PPA process;rinsing the gel PBI membrane;restraining the gel PBI membrane in at least an X-Y plane direction;drying the rinsed gel PBI membrane to form the PBI film; andwherein no organic solvent is employed throughout the process to form the film.11. The film of claim 10 , wherein the film is used as a coating.12. The film of claim 10 , wherein the film is incorporated in a laminate.13. The film of claim 10 , wherein the film has a thickness of from 5 to 150 μm.14. The film of claim 10 , wherein the film has a stress at break of at least 25 MPa.16. The film of further comprising a PBI polymer which is substantially insoluble in organic solvents.17. The film of imbibed with an organic ...

HIGHLY-PERMEABLE DENSE HOLLOW FIBER MEMBRANE FOR BLOOD OXYGENATION

The present invention provides a highly-permeable dense hollow fiber membrane (HFM) for blood oxygenation. A membrane material plays a key role in an oxygenator, which determines the oxygenation efficiency, service life and safety of the oxygenator. The HFM according to the present invention features high permeability. When blood rich in carbon dioxide flows through the oxygenator, the carbon dioxide and oxygen in the blood can be rapidly exchanged, so that the blood can be rapidly updated, and the size of the oxygenator and the blood perfusion volume can be reduced. In addition, the membrane surface of the present invention is hydrophobic and dense, and blood does not directly contact with gas or permeate into a gas pipeline, thus avoiding the problems of protein leakage, permeability reduction and the like. The oxygenator prepared by using the HFM of the present invention can be repeatedly used for a long time. 1. A highly-permeable dense hollow fiber membrane (HFM) for blood oxygenation , wherein the membrane is prepared from Teflon AF 2400 and Teflon AF1600 materials , and features high permeability , desirable hydrophobicity and optimal biocompatibility.2. The HFM according to claim 1 , wherein the HFM is a dense membrane with a pore diameter of 0.01-0.1 nm.3. The HFM according to claim 1 , wherein the HFM has a thickness of 5-100 um.4. The HFM according to claim 1 , wherein a hollow fiber of the HFM has an inner diameter of 20-500 μm.5. The HFM according to claim 1 , wherein the HFM has a length of 0.01-1 m.6. The HFM according to claim 1 , wherein the HFM is formed by a melt extrusion forming method or a solvent casting method.7. The HFM according to claim 1 , wherein the HFM is applied to an in vivo oxygenation process or an extracorporeal blood oxygenation process. The present invention belongs to the technical field of biomedical engineering and particularly relates to a novel highly-permeable dense hollow fiber membrane (HFM) for blood oxygenation. ...

Membranes with reduced particle formation

Disclosed herein are membranes having a first surface, a second surface opposing the first surface, a skin at the first surface having visible pores when viewed at a magnification of 10,000 and a pore size gradient, wherein pore size increases from the second surface to the skin.

THERMALLY-REARRANGED POLYMER BLENDS FOR GAS SEPARATION MEMBRANES

Polymer blends comprising an ortho-functionalized polyimide homo or copolymer and a polybenzimidazole homo or copolymer, wherein the ortho-functionalized polyimide thermally rearranges to a polymer comprising a phenylene heterocyclic group, such as, polybenzoxazole, polybenzothiazole, polybenzimidazole and/or other heterocyclic structure upon heating. Also disclosed are method of forming a polymer blend comprising dissolving an ortho-functionalized polyimide homo or copolymer and a polybenzimidazole homo or copolymer in a solvent, and optional compatibilizer, to form a polymer solution; contacting a support with the polymer solution; and evaporating the solvent to provide a thin layer comprising the polymer blend on the support. Further, methods of heat treating these polymer blends to thermally rearrange the disclosed polyimides are disclosed, as are the polymer blends prepared thereby. Methods of using these polymer blends to separate gases are also disclosed. 1. A polymer blend , comprising: a thermally rearranged ortho-functionalized polyimide homo or copolymer and a polybenzimidazole homo or copolymer , wherein the thermally rearranged polyimide homo or copolymer is a polymer comprising a phenylene heterocyclic group.2. The polymer blend of claim 1 , wherein the thermally rearranged polyimide homo or copolymer comprises a polybenzoxazole claim 1 , polybenzothiazole claim 1 , and/or polybenzimidazole.3. The polymer blend of claim 1 , wherein the polymer blend is a homogenous claim 1 , miscible blend.4. The polymer blend of claim 1 , wherein the polymer blend is an immiscible blend comprising a dispersed phase and a continuous phase.5. The polymer blend of claim 4 , wherein the continuous phase comprises the polybenzimidazole homo or copolymer and the dispersed phase comprises the thermally rearranged polyimide homo or copolymer.6. The polymer blend of claim 4 , wherein the continuous phase comprises the thermally rearranged polyimide homo or copolymer and the ...

ANTIBACTERIAL AND ANTIFOULING POLYMERIC SEPARATION MEMBRANE AND PREPARATION METHOD THEREOF

This invention provides a polymeric separation membrane that has excellent durable antibacterial effect and stain resistance, and a preparation method thereof. The polymeric separation membrane can be widely applied for water treatment, which belongs to the field of water treatment and membrane separation science and technology. The polymeric separation membrane containing quaternary ammonium salt is prepared by the immersion precipitation phase inversion method, using quaternary ammonium salt mixed with polymer and additives. This modification method effectively improves the antibacterial and antifouling ability of the polymeric separation membrane prolongs the service life of membranes and significantly inhibits the reproduction of bacterial and microbial. The preparation method has the advantages of simple process, easy operation, easy for promotion, and also avoids expensive equipment. The polymeric separation membrane has great antibacterial ability and stain resistance, therefore, it has potential application in the field of water treatment. 1. A polymeric separation membrane with enhanced antibacterial ability and antifouling capability , wherein ,preparing by immersion-precipitation phase inversion method with quaternary ammonium salt, as an antibacterial agent, blending with the polymer, pore-forming agent and organic solvent;composing of polymer, quaternary ammonium salt and organic solvent;taking the weight of polymeric separation membrane as the base, the polymeric separation membrane per 100 parts by weight containing 5˜20 parts of polymer, 1˜10 parts of the pore-forming agent, 0.1˜5 parts of quaternary ammonium salt as antibacterial agent, and the rest is organic solvent;the quaternary ammonium salt is alkyl dimethyl benzyl ammonium chloride, alkyl dimethyl benzyl ammonium bromide, cyano quaternary ammonium salt, polynitrogen heterocyclic quaternary ammonium salt, polymeric quaternary ammonium salt, or a mixture thereof;the mixing proportion of ...

POLYIMIDE BLENDS, METHODS OF MAKING EACH AND METHODS OF USE

Embodiments of the present disclosure describe polyimide blend compositions, methods of making polyimide blend compositions, methods of using polyimides, membranes including polyimide blends, methods of making membranes including polyimide blends, methods of separating mixtures using the membranes including polyimide blends, and the like. 1. A polyimide blend composition , comprising:a first 6FDA-based polyimide homopolymer, wherein the first polyimide homopolymer comprises a divalent moiety including one or more hydroxyl groups; anda second 6FDA-based polyimide homopolymer, wherein the second polyimide homopolymer comprises a divalent moiety including one or more carboxyl groups.5. The composition of claim 4 , wherein each of Rand Ris independently one or more of a linear or branched CH claim 4 , wherein p is 1 to 6 claim 4 , an aryl group claim 4 , a halogen claim 4 , and a nitrile group.6. The composition of claim 5 , wherein one or more H is substituted for one or more halogens.7. The composition of claim 4 , wherein A is a substituted or unsubstituted C-Caromatic ring.10. A membrane comprising the polyimide blend composition of .11. The membrane of claim 10 , wherein an asymmetric membrane comprising the polyimide blend is fabricated by a phase-inversion process.12. The membrane of claim 10 , wherein a thin film composite membrane comprising the polyimide blend is fabricated by a solution-coating process on a porous support.13. A method of making a polyimide-blend membrane claim 10 , comprising:mixing a first 6FDA-based polyimide homopolymer and a second 6FDA-based polyimide homopolymer sufficient to form a homogenous solution, wherein the first polyimide homopolymer comprises a divalent moiety including one or more hydroxyl groups and the second polyimide homopolymer comprises a divalent moiety including one or more carboxyl groups;casting the homogenous solution; andremoving solvent.14. The method of claim 13 , wherein mixing includes contacting about 20 wt % ...

Improvements In and Relating to Polymeric Membranes

Disclosed is a method and apparatus for manufacturing a continuous web of polymeric membrane and for continuous downstream processing of said web. The apparatus () comprises: a casting station () for casting the continuous web (M); a carrier () for carrying the web downstream; a membrane drier () downstream of the carrier, for drying the web; and a brushing station () downstream of the drier for brushing the web. Said drier is located immediately downstream of the carrier, and upstream of said brushing station. The apparatus () further includes an additional drying station () downstream of the brushing station (). Brushing after drying retains more surfactant in the membrane which is useful for certain applications. In addition, initial drying eliminates virtually all solvents from the membrane, but leaves some non-solvent (e.g. water) within it, which in turn fixes the surfactant on the nitrocellulose fibers, which improves significantly the consistency and reproducibility of the membrane. 1. A method for manufacturing a membrane comprising the steps of:a) providing a membrane casting mixture containing at least a polymer, a polymer solvent, and a surfactant;b) casting said mix on a carrier;c) initially drying said mixture, in order to evaporate at least the majority of said solvent and to thereby form a porous polymeric membrane and thereby fixing said surfactant in the membrane;d) removing particles of dust on the surface of said dried membrane; ande) further drying the membrane.2. A method as claimed in wherein said removal of dust particles is by means of physical contact between the membrane and a dust removal member claim 1 , for example by means of brushing claim 1 , wiping or rubbing claim 1 , or is by means of a flow of liquid for example by means of a jet of water.3. A method according to wherein said initial drying is performed by means of a heated drum claim 1 , over which the membrane passes claim 1 , said drum being heated to at least 50 degrees ...

COMPOSITE MEMBRANE CONTAINING A POLYDOPAMINE-POLY ACYL HALIDE MATRIX INCORPORATING CARBIDE-DERIVED CARBON AND METHODS THEREOF

A composite membrane including carbide-derived carbon (CDC) particles deposited onto a surface of an intermediate layer which is supported on a porous polysulfone substrate. The intermediate layer contains reacted units of a polyfunctional acyl halide (e.g. trimesoyl chloride) and polydopamine. Methods of making the composite membrane via techniques such as filtration-assisted deposition of CDC particles and interfacial polymerization are specified. Water flux and oil rejection (e.g. diesel) performances of the composite membrane are evaluated. A method of separating an organic compound, such as hydrocarbons, from an aqueous sample utilizing the membrane is also provided. 1: A composite membrane , comprising:a porous support layer comprising a polysulfone;an intermediate layer comprising reacted units of a polyfunctional acyl halide having at least two acyl halide groups and polydopamine; andcarbide-derived carbon particles deposited onto a surface of the intermediate layer,wherein:{'sub': 3', '3', '2', '4', '2, 'the carbide-derived carbon particles are at least one selected from the group consisting of SiC—, FeC—, WC—, TiSiC—, ZrC—, BC—, TaC—, MoC—, and TiC-derived carbon particles; and'}the intermediate layer is disposed on at least a portion of a surface of the porous support layer.2: The composite membrane of claim 1 , wherein the polysulfone is a polyethersulfone.3: The composite membrane of claim 1 , wherein the carbide-derived carbon particles are TiC-derived carbon particles.4: The composite membrane of claim 3 , wherein the TiC-derived carbon particles have a BET surface area of 2 claim 3 ,200-3 claim 3 ,000 m/g.5: The composite membrane of claim 3 , wherein the TiC-derived carbon particles have a pore volume of 0.9-1.8 cm/g.6: The composite membrane of claim 1 , wherein the polyfunctional acyl halide is a polyfunctional acyl chloride.7: The composite membrane of claim 1 , wherein the polyfunctional acyl halide is at least one selected from the group ...

Polyvinylidene Fluoride/Ultra-high Molecular Weight Polyethylene Blend Microporous Membrane and Preparation Method Thereof

Disclosed is a polyvinylidene fluoride/ultra-high molecular weight polyethylene blend microporous membrane and preparation method thereof, which belongs to the field of microporous membrane. The blend microporous membrane has good hydrophobicity, mechanical properties and permeability. The preparation method includes: preparing a suspension by polyvinylidene fluoride, ultra-high molecular weight polyethylene, antioxidant and diluent; then feeding the obtained suspension into a twin-screw extruder, and the cast membrane gel extruded from the outlet is directly injected into a metal mold for injection molding; the mold temperature and the outlet temperature of the extruder are the same, and the cavity surface of the mold has micro-prism array structure; then cooling the mold in aqueous medium to obtain a nascent gel membrane; drying the obtained nascent gel membrane in a freeze dryer after removal of the diluents by extraction. The prepared membrane can be used in the membrane separation technology such as membrane distillation. 1. A preparation method of a polyvinylidene fluoride/ultra-high molecular weight polyethylene blend microporous membrane , wherein , including the following steps:{'b': '1', 'S: drying ultra-high molecular weight polyethylene at 60° C. for 2-3 h, and polyvinylidene fluoride at 90° C. for 2-3 h;'}{'b': 2', '1, 'S: mixing the polyvinylidene fluoride and the ultra-high molecular weight polyethylene prepared in S together with an antioxidant and a diluent system, then stirring for 1-2 h at normal temperature to obtain a uniformly dispersed suspension;'}{'b': 3', '2, 'S: feeding the suspension prepared in S into a twin-screw extruder with 6 heating zones heated individually, wherein the temperature of each heating zone from 1 to 6 are, in order, 130° C., 140° C., 160° C., 175° C., 190-220° C., 200-230° C., and the outlet temperature is 200-250° C.; and injecting the cast membrane gel extruded from the outlet directly into a metal mold for injection ...

Method of nanoscale patterning based on controlled pinhole formation

A method of nanoscale patterning is disclosed. The method comprises: mixing predetermined amounts of a first solvent and a second solvent to generate a solvent, the first solvent and the second solvent being immiscible with each other; dissolving a solute material in the solvent to generate a coating material, the solute material having solubility that is higher in the first solvent than in the second solvent; and applying the coating material onto a substrate to form a plurality of pinholes in the coating material. The formation of the plurality of pinholes is associated with suspension drops mostly comprised of the second solvent, separated from the solute material dissolved in the first solvent, in the coating material. A method of making a stamp with a nanoscale pattern is also disclosed based on the above method.

Polysulfone-Urethane Copolymer, Membranes And Products Incorporating Same, And Methods For Making And Using Same

A polysulfone-urethane copolymer is disclosed, which can be used as a membrane polymer, e.g., a matrix polymer, a pore forming agent, or both, while enhancing a membrane's blood compatibility. Methods are disclosed for forming the copolymer and incorporating the copolymer in membranes (e.g., spun hollow fibers, flat membranes) and other products. 1. A polysulfone-urethane copolymer comprising formula (I) or formula (II):{'br': None, 'sub': a1', 'a2', 'a3, '-[D-E]-[D-G-D]-[E-D]-\u2003\u2003(I)'}{'br': None, 'sub': b1', 'b2', 'b3', 'b4, '[D-(E-D)-(G)-(D-E)]-\u2003\u2003(II)'}wherein G is a urethane block, D is a divalent residue of an aromatic dihydroxyl compound, E is an aromatic sulfone group, and wherein i) a1, a2 and a3 are independently from 1-100 which randomly or non-randomly repeat in formula (I), and ii) b1, b2, b3, and b4 are independently from 1-100 which randomly or non-randomly repeat in formula (II).2. The polysulfone-urethane copolymer of claim 1 , having formula (I):{'br': None, 'sub': a1', 'a2', 'a3, '-[D-E]-[D-G-D]-[E-D]-'}wherein a1 and a3 are independently from 10-100 and a2 is from 1-10 units which randomly or non-randomly repeat in formula (I).3. The polysulfone-urethane copolymer of claim 1 , having formula (II):{'br': None, 'sub': b1', 'b2', 'b3', 'b4, '[D-(E-D)-(G)-(D-E)]-'}wherein b1 and b3 are independently from 10-100 and b2 and b4 are independently from 1-10 units which randomly or non-randomly repeat in formula (II).4. The polysulfone-urethane copolymer of claim 1 , having formula (III):{'br': None, 'sub': g', 'y', 'i, 'J-D-[X]-[D-G-D]-[X]-D-J'}wherein J is an end group of the polymer, X is a polysulfone block comprised of aromatic dihydroxyl compound and dihalodiphenyl sulfone, wherein g and i are independently from 1-100 units.5. The polysulfone-urethane copolymer of claim 4 , wherein each J is a mono-reacted residue of a dihalodiphenyl sulfone or a polysulfone block containing an aromatic dihydroxyl compound and a dihalodiphenyl ...

POROUS THERMOPLASTIC MEMBRANES

The present invention is directed to a membrane, comprising a polyurethane (PU1), wherein the polyurethane (PU1) is based on 80 to 100% by weight of a mixture of at least one diol (D1) and at least one polyisocyanate (I1), and 0 to 20% by weight of at least one compound (C1) with at least two functional groups which are reactive towards isocyanate groups. Furthermore, the present invention is directed to a process for preparing a membrane, comprising providing a solution (L1) at least comprising a polyurethane (PU1) and preparing a membrane from solution (L1) using phase inversion; as well as the use of a membrane according to the present invention for coating a woven article. 116-. (canceled)17. A membrane , comprising a polyurethane (PU1) , wherein the polyurethane (PU1) comprises:80 to 100% by weight of a mixture of at least one diol (D1) and at least one polyisocyanate (I1), and0 to 20% by weight of at least one compound (Cl) with at least two functional groups which are reactive towards isocyanate groups,wherein the membrane has pores with an average pore diameter in the range of from 0.001 μm to 0.8 μm, determined using Hg porosimetry according to DIN 66133,wherein the pore size distribution has a gradient over the diameter of the membrane.18. The membrane according to claim 17 , wherein the membrane comprises a further polyurethane (PU2) which is based on at least one polyol (P2) claim 17 , at least one diol (D2) and at least one polyisocyanate (I2)19. The membrane according to claim 17 , wherein the compound (C1) is a polyol.20. The membrane according to claim 17 , wherein the compound (C1) is selected from the group of divalent residues of an oligo- or polysiloxane of the formula{'br': None, 'sub': q', '2', '2', 'p', '2', 'q′, '-[Ak-O]-Ak-Si(R)—[O—Si(R)]—O—Si(R)-Ak-[O-Ak]- \u2003\u2003(1)'}{'sub': 2', '4', '1', '4, 'wherein Ak represents C-Calkylene, R represents C-Calkyl, and each of p, q and q′ independently is a number selected from the range 0-50.'}21. ...

Support layers for forward osmosis membranes

The invention relates generally to forward osmosis membranes and methods of making forward osmosis membranes, in particular improved thin support layer upon which an active layer is cast.

Membranes in the form of hollow fibers for the separation of co2 from natural gas and method of preparation by heat treatment and development of a polymeric membrane precursor

The present invention deals with a method for obtaining membranes in the form of hollow fibers with application in the field of carbon dioxide removal from natural gas. The aforementioned membranes are obtained by means of heat treatment of polymeric membranes. In this method, polymeric membranes are obtained by a phase-inversion technique by immersion-precipitation and are subsequently subjected to a heat treatment, that is, that the membranes effectively become precursor membranes of the heat treatment. The heat treatment process involves the optimization of the heating rate, temperature, and stabilization time variables, aiming at the improvement of the transport properties of the polymeric membranes. After the heat treatment, it becomes possible to use the membranes in separation processes of gases which operate at pressures greater than 30 bar, with selectivity for carbon dioxide (CO 2 ).

SEPARATION MEMBRANES

A process for the preparation of ultrafiltration and microfiltration polymeric flat sheet separation membranes is disclosed, the process comprising a unidirectional cooling step. Membranes prepared according to the process exhibit numerous advantages over ultrafiltration and microfiltration membranes prepared via conventional processes. In particular, the membranes prepared by the present process exhibit remarkable pure water flux, superior mechanical properties and increased anti-fouling characteristics. Also disclosed are particular PVDF ultrafiltration and microfiltration membranes having improved flux, mechanical and anti-fouling properties. 1. A process for the preparation of a flat sheet polymeric membrane having an average pore size of 0.01-10 μm , the process comprising the steps of:a) providing a polymeric dope solution comprising a polymer and a first solvent, wherein the melting temperature of the first solvent ranges from 2 to 28° C.;b) casting the polymeric dope solution onto a substrate to form a cast polymeric film, the cast polymeric film having a first surface being in contact with the substrate, and a second surface disposed opposite the first surface;c) subjecting the cast polymeric film to a cooling means, the cooling means being provided at a temperature that is 5-120° C. below the melting temperature of the first solvent; andd) contacting the cooled cast polymeric film with a second solvent, the second solvent being provided at a temperature below the melting point of the first solvent,wherein during step c) only one of the first and second surfaces of the cast polymeric film is subjected to the cooling means.2. The process of claim 1 , wherein the polymer is selected from PVDF claim 1 , poly(ethersulfone) claim 1 , cellulose acetate claim 1 , poly(acrylonitrile) claim 1 , poly(ether ether ketone) claim 1 , sulfonated poly(ether ether ketone) claim 1 , poly(benzimidazole) claim 1 , sulfonated poly(benzimidazole) claim 1 , poly(imide) claim 1 , ...

CONDUCTIVE MEMBRANE AND PREPARATION METHOD THEREOF

The present application discloses a conductive membrane and a preparation method thereof, which belong to the field of membrane separation technology. The conductive membrane provided by the present application includes a porous base layer film, a porous intermediate layer film, and a porous conductive layer film which are disposed layer by layer in sequence; wherein at least some holes of the base layer film are communicated with holes of the conductive layer film through holes of the intermediate layer film, and material of the intermediate layer film is the same as material of the base layer film and of the conductive layer film. Regarding the conductive membrane provided by the present application, it can be coupled with electrochemical technology, so that the membrane exhibits new excellent properties at the same time of playing separating characteristic. 1. A conductive membrane , whereinthe conductive membrane comprises a porous base layer film, a porous intermediate layer film, and a porous conductive layer film which are disposed layer by layer in sequence;wherein at least some holes of the base layer film are communicated with holes of the conductive layer film through holes of the intermediate layer film, and material of the intermediate layer film comprises material of the base layer film and of the conductive layer film.2. The conductive membrane according to claim 1 , whereinthe base layer film comprises first polymer film material, the conductive layer film comprises second polymer film material and conductive modified material, and the intermediate layer film comprises the first polymer film material, the conductive modified material, and the second polymer film material.3. The conductive membrane according to claim 2 , whereinthe conductive modified material comprises graphene and carboxylated multi-wall carbon nanotubes; and/orthe first polymer film material and the second polymer film material comprise at least one of polyethersulfone (PES), ...

Polystyrene-b-polyethylene oxide block copolymer membranes, methods of making, and methods of use

Embodiments of the present disclosure provide for polystyrene-b-polyethylene oxide (PS-b-PEO) block copolymer nanoporous membranes, methods of making a PS-b-PEO block copolymer nanoporous membrane, methods of using PS-b-PEO block copolymer nanoporous membranes, and the like.

CONTINUOUS LATERAL PORE GRADING FOR SCALABLE EFFICIENCY OF MEMBRANES IN ELECTROCHEMICAL APPLICATIONS

Processes for manufacturing continuous laterally graded porous membranes are disclosed. Such processes utilize freeze casting techniques with a continuous varying solids loading method to make laterally graded porous membranes. Also disclosed are laterally graded porous membranes. 1. A process for making a porous membrane , comprising: providing a first slurry, wherein the first slurry comprises a starting material in a solvent, wherein the solid starting material in the solvent has at least 1 vol % solids loading in the solvent, including one, several or all of a binder, a dispersant and/or a thickener;', 'providing a second slurry, wherein the second slurry comprises a starting material in a solvent, wherein the solid starting material in the solvent has greater than 10 vol % solids loading in the solvent, including one several or all of a binder, a dispersant and/or a thickener;', 'continuously mixing the first and second slurries together in controlled amounts to provide a casting material, wherein the casting material has controllable varying solids loadings;', 'metering the casting material onto a casting bed to form a membrane cast;', 'freeze tape casting the membrane cast;', 'freeze drying the membrane cast to form the porous membrane having the pre-selected porosity range and the pre-selected gradient; and', 'optionally sintering the porous membrane., 'manufacturing a laterally graded, porous membrane having a pre-selected porosity range and a preselected linear or non-linear gradient within the porous membrane by'}2121. The process of wherein the continuously mixing the first and second slurries together in controlled amounts further comprises feeding slurry at a defined rate claim 1 , and feeding of slurry as the feeding of slurry is slowed.3. The process of claim 1 , wherein the solids loading of the first slurry is in the range of 10 vol % to 40 vol % and the second slurry is in the range of 10 vol % to 40 vol % or in the range of 20 vol % to 30 vol %.4 ...

GAS SEPARATION MEMBRANE COMPRISING CROSSLINKED BLENDS OF RUBBERY POLYMERS

A method for making a gas separation membrane comprises dissolving and mixing poly(ether-b-amide) (Pebax) copolymer and acrylate-terminated polyethylene glycol oligomers (PEGDA) in a solvent, casting the polymer solution into a mold, removing the solvent to form a film, adding a photoinitiator to the film and irradiating the film with ultraviolet radiation to induce crosslinking of the PEGDA in the film, producing XLPEGDA, and submerging the film after exposure in a crosslinking solution to form crosslinked Pebax (XLPebax) in the film, wherein the crosslinking solution comprises one of a diisocyanate, a diisocyanate derivative and a combination of a diiscyanate and a diisocyanate derivative. 1. A method of making a gas separation membrane comprising:dissolving and mixing poly(ether-b-amide)(Pebax) copolymer and acrylate-terminated polyethylene glycol oligomers (PEGDA) in a solvent to define a polymer solution;casting the polymer solution into a mold;removing the solvent to form a film;adding a photoinitiator to the film and irradiating the film with ultraviolet radiation to induce crosslinking of the PEGDA in the film, producing XLPEGDA; andsubmerging the film, after exposure to the ultraviolet radiation, in a crosslinking solution to form crosslinked Pebax (XLPebax) in the film, wherein the crosslinking solution comprises one of a diisocyanate, a diisocyanate derivative and a combination of a diiscyanate and a diisocyanate derivative.3. The method of claim 1 , wherein the diisocyanate comprises tolylene-2 claim 1 ,4-diisocyanate (TDI) claim 1 , hexamethylene-diisocyanate (HDI) claim 1 , 4 claim 1 ,4′-Methylenediphenyl diisocyanate (MDI) claim 1 , or Dimethoxy biphenylene diisocyanate (DMDI).4. The method of claim 1 , wherein the photoinitiator comprises 1-hydroxycyclohexyl phenyl ketone (HCPK) claim 1 , benzophenone or combinations thereof.5. The method of claim 1 , wherein in the dissolving step claim 1 , the PEGDA comprises between about 1 wt. % and about 90 wt. ...

Composite Filtration Membranes from Conducting Polymer Nanoparticles and Conventional Polymers

In one aspect, the invention relates to composite filtration membranes for use in, for example, water purification and concentrating a solute, and methods for making and using same. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention. 1. A method comprisingdispersing polypyrrole nanoparticles in a polymer matrix;solution casting the polypyrrole nanoparticles dispersed in the polymer matrix, thereby forming a polypyrrole-nanoparticle composite membrane.2. The method of claim 1 , wherein the polypyrrole-nanoparticle composite membrane is solution cast onto a support structure.3. (canceled)4. The method of claim 1 , wherein the polypyrrole nanoparticle composite membrane is formed by phase inversion.5. The method of claim 2 , wherein the support structure is a nonwoven support fabric.6. (canceled)7. The method of claim 1 , wherein the polymer matrix is in a suspension or a solution.8. (canceled)9. The method of claim 1 , wherein the solution casting is nonsolvent induced phase separation.1012-. (canceled)13. The method of claim 1 , further comprising polymerizing a thin film onto a surface of the polypyrrole-nanoparticle composite membrane.14. (canceled)15. The method of claim 1 , wherein the polymer matrix comprises polysulfone.16. A filtration membrane prepared by the method of .17. A membrane comprising:(a) a polymer matrix; and(b) polypyrrole nanoparticles dispersed within the polymer matrix.18. The membrane of claim 17 , wherein the membrane further comprises a support structure.19. The membrane of claim 18 , wherein the support structure is a nonwoven support fabric.20. The membrane of claim 17 , wherein the membrane is a hollow fiber membrane.21. The membrane of claim 17 , wherein the polymer matrix comprises polysulfone claim 17 , sulfonated polysulfone claim 17 , polyethersulfone claim 17 , sulfonated polyethersulfone claim 17 , polyaniline claim 17 , ...

Hydrophobic and Porous Sorbent Polymer Composites and Methods for CO2 Capture

Sorbent polymer composites and a solution-casting method of making hydrophobic sorbent polymer composites for CO2 adsorption applications are described. The sorbent polymer composites are comprised of a polymer matrix, a dispersed CO2 sorbent, and an optional filler particle for hydrophobicity modification. 1. A method of making a sorbent polymer composite membrane , comprising: mixing a dissolved fluoropolymer and a sorbent in an organic solvent to form a mixture;wherein the fluoropolymer and sorbent comprise at least 5 mass % of the mixture;adding a nonsolvent to the mixture to form a phase inversion coating composition;wherein the mass ratio of nonsolvent to solvent in the coating composition is 0.2 or less;applying a film of the coating composition to a substrate via a casting knife;vaporizing the solvent from the film at a temperature <150° C. from the mixture to increase the ratio of nonsolvent/solvent so that the fluoropolymer precipitates from the solvent; andforming a porous fluoropolymer film with dispersed sorbent.2. The method of further comprising drying the porous fluoropolymer film at an elevated temperature above 30° C. to remove the solvent and nonsolvent.3. The method of wherein the elevated temperature is in the range of 30-100° C.4. The method of any of wherein the mixture comprises at least 7 mass % claim 1 , or at least 8 mass % claim 1 , or 8 to 15 mass % claim 1 , or 8 to 10 mass % fluoropolymer plus sorbent.5. The method of any of the above wherein the mixture comprises at least 4 mass % claim 1 , or at least 8 mass % claim 1 , or 8 to 15 mass % claim 1 , or 5 to 20 mass % or 8 to 10 mass % fluoropolymer.6. The method of wherein the coating composition has a mass ratio of nonsolvent/solvent (for example water/acetone) of 0.2 or less claim 1 , or 0.1 or less claim 1 , or in the range of 0.02 to 0.10 claim 1 , or 0.04 to 0.08 or 0.024-0.100.7. The method of wherein the step of vaporizing is conducted at <150 or <100 or <80° C. claim 1 , or in ...

Thin Film Composite Membrane with Nano-sized Bubbles Having Enhanced Membrane Permeability, Preparation Methods and Uses Thereof

Thin film composite membrane with nano-sized bubbles having enhanced membrane permeability, preparation methods and uses thereof are provided. The method of preparation of a thin film composite membrane, comprising: a) an aqueous solution containing at least an amine, and b) an organic solution containing at least a polyfunctional acyl halide, an additive or soluble gas being present in a) and/or b), or a nano-bubble generator or ultrasound are used to generate nano-bubbles in a) and/or b). Interfacial polymerization of a) and b) occurs at or near the surface of a porous support membrane. The advantage of creating nano-sized bubbles in the separating layer of membrane is that it can reduce membrane resistance without sacrificing the mechanical strength and stability of the membrane so as to improve its water permeability, salt rejection and antifouling. In addition, the process is simple to adopt while performance improvement of the membrane is remarkable. 1. A method of fabricating a thin film composite membrane , comprising the steps of:{'sub': 3', '3, 'adding a certain amount of NaHCOin a 1,3-phenylendiamine (MPD) aqueous solution, wherein the concentration of NaHCOin the MPD aqueous solution is in the range from 0 to the saturated concentration; preferably, the concentration of MPD in the MPD aqueous solution is in the range of 0.01˜10.0 wt. %;'}pouring the MPD aqueous solution on the top surface of a polysulfone substrate and allowing it to soak for 10 seconds-5 hours;carefully removing the excess MPD aqueous solution from the membrane surface by rolling it with a rubber roller;pouring a 1,3,5-benzenetricarbonyl trichloride (TMC) hexane solution with a concentration of 0.0005-2.0 wt. % onto the MPD-soaked membrane substrate to get a reaction in 5 seconds-30 min, so that a thin film is formed via interfacial polymerization;draining the hexane solution from the thin film membrane;placing the membrane in warm water at 25-80 degrees centigrade for 0-30 min; ...

Polyamide Flat Sheet Membranes With Microporous Surface Structure for Nanoparticle Retention

The present disclosure provides a flat-sheet polyamide membrane comprising a first major surface and a second major surface and a separation layer and a porous substructure in the cross section of the membrane between the first major and the second major surface, wherein the average pore size diameter in the separation layer is smaller than the average pore size diameters on the first and second major surfaces, wherein the average pore size diameter on the first major surface is larger than the average pore size diameter on the second major surface, wherein the separation layer is closer to the second major surface than to the first major surface. The present disclosure further provides a method for producing such membranes and a use of the membranes for nanofiltration or ultrafiltration purposes. 1. A flat-sheet polyamide membrane comprising a first major surface and a second major surface and a separation layer and a porous substructure in the cross section of the membrane between the first major and the second major surface , wherein the average pore size diameter in the separation layer is smaller than the average pore size diameters on the first and second major surfaces , wherein the average pore size diameter on the first major surface is larger than the average pore size diameter on the second major surface , wherein the separation layer is closer to the second major surface than to the first major surface.2. The membrane according to claim 1 , wherein the maximum of the pore size distribution in the separation layer according to ASTM F316-03 is in the range of from 5 to 50 nm.3. The membrane according to claim 1 , wherein the surface porosity on the first major surface is larger than the surface porosity on the second major surface.4. The membrane according to claim 1 , wherein the membrane has a surface porosity on the first major surface of at least 20% claim 1 , preferably of at least 25% claim 1 , and more preferably of at least 30%.5. The membrane ...

CROSSLINKED POLYMER MEMBRANES AND METHODS OF THEIR PRODUCTION

Described in the present application are methods of producing silane-crosslinked polymer membranes at moderate temperatures using acid catalysts that, in certain embodiments, result in membranes with unexpectedly high permeabilities and selectivities. In certain embodiments, grafting and crosslinking of the silanes occur by immersing a preformed membrane in a solution comprising a silane and an acid catalyst. Alternatively, in certain embodiments, grafting of silanes to a polymer occurs in the presence of acid catalyst in solution and subsequent casting and drying produces crosslinked membranes. In certain embodiments, an acid catalyst is a weak acid catalyst. Also described in the present application are asymmetric crosslinked polymer membranes with porous layers. In certain embodiments, crosslinked cellulose acetate membranes have permeability up to an order of magnitude greater than the permeability of unmodified cellulose acetate membranes. The membranes have porous layers with a high porosity due to their processing in moderate conditions. 113-. (canceled)14. A method for modifying a preformed polymer membrane , the method comprising:immersing a preformed polymer membrane in a solution comprising a weak acid catalyst and a silane, wherein the preformed polymer membrane comprises a polymer repeat unit comprising a pendant nucleophile; andmaintaining the solution, wherein the membrane is immersed, at a crosslinking temperature of at least 100° C. but less than the glass transition temperature of the membrane for a crosslinking period, thereby crosslinking the membrane with at least a portion of the silane.15. The method of claim 14 , wherein the crosslinking period is at least 5 minutes.16. The method of claim 14 , further comprising:removing the membrane from the solution; anddrying the membrane at a drying temperature of at least 100° C.17. The method of claim 16 , further comprising:solvent exchanging the membrane with a non-solvent after removing the membrane ...

MEMBRANE WITH AN ISOPOROUS, ACTIVE SEPARATION LAYER, AND METHOD FOR PRODUCING A MEMBRANE

The invention relates to a method for producing a polymer membrane with an isoporous, active separation layer, particularly an ultrafiltration membrane or nanofiltration membrane and to a polymer membrane produced or producible according to the invention. The method comprises the following steps: producing a casting solution having at least one solvent in which at least one amphiphilic block copolymer with at least two different polymer blocks and at least one carbohydrate are dissolved, spreading out the casting solution to form a film, allowing a part of the at least one solvent near the surface to evaporate during a waiting time, precipitating a membrane by immersing the film in a precipitation bath comprising at least one non-solvent for the block copolymer. 1. A method for producing a polymer membrane with an isoporous , separation-active layer , especially an ultrafiltration membrane or nanofiltration membrane comprising the following steps:producing a casting solution having at least one solvent in which are dissolved at least one amphiphilic block copolymer with at least two different polymer blocks and at least one carbohydrate,spreading out the casting solution to form a film,allowing a near-surface part of the at least one solvent to evaporate during a waiting time, andprecipitating a membrane by immersing the film in a precipitation bath comprising at least one non-solvent for the block copolymer.2. The method according to claim 1 , wherein the carbohydrate is saccharose claim 1 , D(+) glucose (=grape sugar) claim 1 , D(−) fructose (=fruit sugar) and/or cyclodextrine claim 1 , especially α-cyclodextrine.3. The method according to claim 1 , wherein the at least one block copolymer comprises two or three polymer blocks A claim 1 , B and possibly C which are different from each other with the configuration A-B claim 1 , A-B-A or A-B-C claim 1 , wherein each of the polymer blocks are selected from the group of polystyrene claim 1 , poly-4-vinylpyridine claim ...

MEMBRANE WITH SURFACE CHANNELS

Membranes having parallel channels in a surface of the membranes, wherein the channels have side walls having rough surfaces; filters and devices including at least one membrane, and methods of making and using the membranes, are disclosed. 1. A microporous polymeric membrane comprising(a) a first surface, comprising a microporous surface,(b) a second surface comprising a microporous surface; and 'wherein the membrane has a machine direction and a cross machine direction, and the first surface has a plurality of parallel channels in the machine direction, wherein the channels have side walls and bottom walls, the side walls comprising rough surfaces, the rough surfaces having an Ra in the range of from about 4.5 μin to about 19.0 μin.', '(c) a microporous bulk between the first surface and the second surface;'}2. The membrane of claim 1 , wherein the channels have side walls having rougher surfaces than the bottom walls.3. The membrane of claim 1 , wherein the side walls have rough surfaces having an Ra in the range of about 5 μin to about 9 μin.4. The membrane of claim 1 , wherein the side walls have rough surfaces having an Ra in the range of about 9.5 μin to about 16.0 μin.5. The membrane of claim 1 , wherein at least about 35% of the first surface has the plurality of parallel channels in the machine direction.6. The membrane of claim 1 , comprising a sulfone membrane.7. The membrane of claim 6 , comprising a polyethersulfone membrane.8. The membrane of claim 1 , comprising a polyamide membrane claim 1 , or a PVDF membrane.9. A filter comprising at least one membrane according to .10. A filter comprising at least two membranes according to .11. A method of removing undesirable material from a fluid claim 1 , the method comprising passing the fluid from a first surface of a microporous membrane through a second surface of the membrane claim 1 , the first surface comprising a microporous surface claim 1 , the second surface comprising a microporous surface; the ...

Nanocomposite membrane for direct methanol fuel cells

A method for synthesizing a nanocomposite membrane, and a synthesized nanocomposite membrane made thereby. The method may include steps of preparing Fe 3 O 4 -tolylene di-isocyanate (TDI) nanoparticles by reacting Fe 3 O 4 nanoparticles and TDI powder, preparing Fe 3 O 4 -TDI-TiO 2 nanoparticles, sulfonating the Fe 3 O 4 -TDI-TiO 2 nanoparticles, preparing a first polymer solution, dispersing the Fe 3 O 4 -TDI-TiO 2 —SO 3 H nanoparticles into the first polymer solution to obtain a second homogenous solution, and casting and drying the second homogenous solution to obtain the nanocomposite membrane.

SERIAL ARRANGEMENT HAVING MULTIPLE PLIES OF ASYMMETRIC FILTER MEDIA, PRODUCTION METHOD, FILTRATION UNIT, USE OF THE ARRANGEMENT, AND CHARACTERIZATION METHOD

The present invention relates to a serial arrangement comprising n plies of asymmetric filter media, wherein n is at least two and the pore size of the n plies substantially continuously decreases in the thickness direction of the serial arrangement, to a production method for the serial arrangement, to a filtration unit comprising the serial arrangement, to the use of the serial arrangement, and to a method for characterizing the pores of a filter medium. 1. A serial arrangement of filter media that comprises n plies , whereinn is at least two,each of the n plies is an asymmetric filter medium having an asymmetry factor of at least 1.5,the n plies have an overall asymmetry factor of at least 10, andthe pore size of the n plies substantially continuously decreases in the thickness direction of the serial arrangement.2. The serial arrangement as claimed in claim 1 , wherein the filter medium is a microporous membrane.3. The serial arrangement as claimed in claim 1 , wherein the arrangement is an assembly composed of n plies of asymmetric filter media which are loosely stacked on top of one another and are claim 1 , in the edge regions of the plies claim 1 , embedded in a filter housing.4. The serial arrangement as claimed in claim 1 , comprising 2 to 10.5. The serial arrangement as claimed in claim 1 , having a thickness of 100 to 1000 μm.6. The serial arrangement as claimed in claim 1 , wherein the pore size of the n plies decreases linearly claim 1 , concavely or convexly in the thickness direction.7. The serial arrangement as claimed in claim 1 , wherein the thickness of the plies is claim 1 , independently of one another claim 1 , 50 to 250 μm.8. The serial arrangement as claimed in claim 1 , wherein the plies are constructed from PVDF claim 1 , PTFE claim 1 , cellulose ester claim 1 , cellulose hydrate claim 1 , polyamide claim 1 , polysulfone claim 1 , polyarylsulfone claim 1 , polyacrylic acid claim 1 , polymethacrylic acid claim 1 , acrylic acid-methacrylic ...

FUNCTIONALIZED POLY(DIALLYLPIPERIDINIUM) AND ITS COPOLYMERS FOR USE IN ION CONDUCTING APPLICATIONS

The invention relates to membranes, monomers and polymers. The monomers can form polymers, which can be used for membranes. The membranes can be used in alkaline fuel cells, for water purification, for electrolysis, for flow batteries, and for anti-bacterial membranes and materials, as well as membrane electrode assemblies for fuel cells. In addition to the membranes, polymers and monomers and methods of using the membranes, the present invention also relates to methods of making the membranes, monomers and polymers. 1. A method of forming a poly(diallylammonium) multiblock copolymer , comprising:mixing a diallylammonium polymer functionalized on a first end and a second end with a first group, a first difunctional monomer functionalized with a second group and a second difunctional monomer functionalized with a third group form a first mixture; andreacting the first mixture to form the poly(diallylammonium) multiblock copolymer.2. The method of claim 1 , wherein the second group of the second difunctional monomer functional group is the same as the first group.3. The method of claim 1 , wherein the first group is a halophenyl sulfone.4. The method of claim 1 , wherein the reacting comprises:heating the first mixture in an inert environment at a temperature between about 100° C. and about 175° C. for between about 1.5 hours and about 24 hours to form a heated first mixture, wherein the first difunctional monomer is a halophenyl sulfone and wherein the second difunctional monomer is a bisphenol to form a heated mixture;precipitating the heated mixture with an alcohol to form a precipitate in solution; andseparating the poly(allyl ammonium) multiblock copolymer, wherein the poly(allyl ammonium) multiblock copolymer is a polysulfone-poly(diallylammonium) multiblock copolymer.5. The method of claim 1 , wherein the diallylammonium polymer comprises diallylammonium monomers.6. The method of claim 1 , further comprising an anion claim 1 , wherein the anion is selected from ...

METHOD FOR PREPARING THE NETWORK-PORE POLYVINYLIDENE FLUORIDE MEMBRANE BASED ON POLYVINYL ALCOHOL GEL

A method for preparing the network-pore polyvinylidene fluoride membrane based on polyvinyl alcohol (PVA) gel includes the steps of (1) mix and stir PVA, masking agent and solvent, heat and dissolve the mixture evenly under 105 degree Celsius to obtain a PVA solution; (2) in the PVA solution, add PVDF and pore-forming agent, where the rest shall be added with the solvent until the total mass fraction sum is 1, stir, heat and dissolve the solution evenly to obtain the homogeneous casting solution; (3) the casting solution is filtered, deaerated, phase-separated and solidified as membrane A; (4) removes the PVA gel from membrane A to obtain membrane B; (5) membrane B is washed with water to remove the residual solvent to obtain the PVDF membrane with network-pore structure. The resulting PVDF membrane is an asymmetric membrane with an ultra-thin cortex and an interpenetrating network-pore sub-cortex structure. 1. A method for preparing the network-pore polyvinylidene fluoride membrane based on polyvinyl alcohol gel , which mainly comprises:(1) Mix and stir PVA, masking agent and solvent according to a certain mass ratio, i.e. 0.5-5%, 1-8%, 30-60%, heat and dissolve the mixture evenly under 105 degree Celsius, to obtain the PVA solution;(2) In the aforementioned PVA solution, add PVDF of 10-30% and pore-forming agent of 1-10%, where the rest shall be added with the solvent until the total mass fraction sum is 1, stir, heat and dissolve the solution evenly under 80 degree Celsius, to obtain the homogeneous casting solution;(3) The casting solution is filtered, deaerated and coated on a smooth clean glass plate with the coating thickness of 250 μm in a closed environment for membrane making with a temperature of 20-40 degree Celsius and a humidity of 40-70%, and then after staying in the air for 10-45 s, it is placed in the gel bath of 20-50 degree Celsius to be phase-separated and solidified as the membrane A;(4) The membrane A is treated by the post-treatment process ...

SEPARATION MEMBRANE AND METHOD FOR PRODUCING SAME

An object of the present invention is to provide a separation membrane having high mechanical strength and being less likely to cause clogging and capable of continuously maintaining high water permeation performance. The present invention relates to a separation membrane characterized in that the average diameter D of a spherical structure in a region within 10 μm from a first surface in a separation membrane having a spherical structure layer formed of a thermoplastic resin and the average diameter D of a spherical structure in a region of 10 μm to 20 μm from a second surface satisfy the relational expression of D>D and the average diameter D and the average diameter D of a spherical structure in a third region satisfy the relational expression of 1.10D, and'}{'b': 1', '3', '3', '1', '3, 'the average diameter D and an average diameter D of a spherical structure S in a region of 10 μm to 20 μm from the first surface satisfy a relational expression of 1.10 Подробнее

Forward Osmosis, Reverse Osmosis, and Nano/Micro Filtration Membrane Structures

Disclosed is a composition for forming or treating reverse osmosis (RO), forward osmosis (FO), microfiltration (MF), or nanofiltration (NF) membranes, which includes a stable liquid blend of two of the following polymers: an oxygen polymer, a nitrogen polymer, and a sulfur polymer, where each polymer in a blend have matched solubility parameters; provided, that a nitrogen polymer can be in the form of a powder; where the weight ratio of polymers in each blend can range from 1:99 to 99:1; where each polymer optionally can be halogenated; where any polymer can be dispersed in a solvent for forming the blend. 1. A composition for forming or treating reverse osmosis (RO) , forward osmosis (FO) , microfiltration (MF) , or nanofiltration (NF) membranes , which comprises:a stable liquid blend of two of the following polymers: an oxygen polymer, a nitrogen polymer, and a sulfur polymer, where each polymer in a blend have matched solubility parameters; provided, that a nitrogen polymer can be in the form of a powder; where the weight ratio of polymers in each blend can range from 1:99 to 99:1; where each polymer optionally can be halogenated; where any polymer can be dispersed in a solvent for forming the blend.2. The composition of claim 1 , wherein said oxygen polymer is one or more of a cellulose acetate claim 1 , a cellulose triacetate claim 1 , an acrylic claim 1 , acrylic modified alkyd claim 1 , an epoxy claim 1 , polyvinyl alcohol claim 1 , polyvinyl chloride claim 1 , polyvinyl acetate claim 1 , or a polyester; said nitrogen polymer is one or more of a special nylon claim 1 , an amine claim 1 , a melamine claim 1 , or a polyurethane; and said sulfur polymer is one or more of a polysulfide claim 1 , a polysulfone claim 1 , or a polyethersulfone.3. The composition of claim 1 , which additionally comprises one or more of amino acids claim 1 , chelating agents claim 1 , or nano or micro size particles or fibers.4. The composition of claim 1 , which is in the form of ...

CARBON-DIOXIDE-SEPARATING MEMBRANE

A carbon dioxide separation membrane includes a skin layer having a function of separating carbon dioxide from a mixed gas, wherein the skin layer contains 30 to 90% by mass of a polymer resin in which a difference between an affinity to carbon dioxide and an affinity to at least one of hydrogen and helium, the affinities are expressed as free energy ΔG (kcal mol), is 4.5 kcal molor more and less than 10 kcal mol, and from 10 to 70% by mass of an organic liquid having an affinity to carbon dioxide. 110-. (canceled)11. A carbon dioxide separation membrane comprising a skin layer having a function of separating carbon dioxide from a mixed gas ,{'sup': −1', '−1', '−1, 'wherein the skin layer contains 30 to 90% by mass of a polymer resin in which a difference between an affinity to carbon dioxide and an affinity to at least one of hydrogen and helium, said affinities are expressed as free energy ΔG (kcal mol), is 4.5 kcal molor more and less than 10 kcal mol, and from 10 to 70% by mass of an organic liquid having an affinity to carbon dioxide.'}12. The membrane according to claim 11 , wherein the polymer resin has a diffusion coefficient of the at least one of hydrogen and helium of less than 2.5×10cms.14. The membrane according to claim 11 , wherein the organic liquid is an amine compound.15. The membrane according to claim 11 , wherein the organic liquid is an amine compound having a melamine skeleton.16. A method of concentrating carbon dioxide comprising causing a mixed gas containing carbon dioxide and at least one of hydrogen and helium to permeate through the carbon dioxide separation membrane according to .17. The method according to claim 16 , wherein the mixed gas has a temperature of 60° C. or higher.18. A method of producing the carbon dioxide separation membrane according to comprising:obtaining a film-forming raw liquid by dissolving the polymer resin and the organic liquid in an organic solvent;forming a membrane from the film-forming raw liquid; andheat- ...

Methanesulfonic Acid Mediated Solvent Free Synthesis of Conjugated Porous Polymer Networks

The present disclosure relates to synthesis of porous polymer networks and applications of such materials. The present disclosure relates to a method of fabricating of a porous polymer network comprising: (a) providing: (i) a first reactant comprising a plurality of compounds comprising at least one acetyl group, said plurality of compounds comprising at least one compound type, and (ii) a second reactant comprising an alkylsulfonic acid, and (b) creating a solution of said reactants, (c) casting said solution in a form, and (d) treating said solution under such conditions so as to produce a porous polymer network. In one embodiment, the invention relates to a porous polymer network which has a basic structure selected from the group consisting of 122-. (canceled)24. The method of claim 23 , wherein the casting of step (c) comprises:i) deposition of portion of said solution upon said first glass substrate, andii) application of said second glass substrate upon said first glass substrate such that the solution is between said substrates.25. The method of claim 23 , wherein the treating of step (d) comprises:i) heating said substrates under such conditions to produce a porous polymer network film.26. The method of claim 23 , wherein said alkylsulfonic acid is methanesulfonic acid.27. The method of claim 23 , wherein said method is lacking a toxic acid.28. The method of claim 23 , wherein said method is lacking an acid that decomposes at high temperatures.29. The method of claim 23 , wherein said method further provides additional elements selected from the group consisting of: carbon nanotubes claim 23 , metal nanowires claim 23 , dendritic metal micro/nano-particles claim 23 , carbon nanofibers claim 23 , redox active metaloxide nanoparticles claim 23 , graphene claim 23 , graphene oxide claim 23 , and reduced graphene oxide claim 23 , within said form which become embedded within the porous polymer network after the reaction.30. (canceled)31. The method of claim 23 ...

SULFONATED POLYARYLETHERSULFONES AND MEMBRANES THEREOF

The present invention relates to a process for the preparation of a sulfonated polyarylene ether sulfone polymer (sP) by converting a reaction mixture (R) which comprises, among others, at least one non-sulfonated aromatic dihalogen sulfone, at least one sulfonated aromatic dihalogen sulfone and at least one aromatic dihydroxy component comprising trimethylhydroquinone. The present invention furthermore relates to a sulfonated polyarylene ether sulfone polymer (sP) obtainable by the inventive process and to its use in a membrane (M). Furthermore, the present invention relates to a membrane (M) comprising this sulfonated polyarylene ether sulfone polymer (sP) and to a method for the preparation of the membrane (M). 114.-. (canceled)15. A process for the preparation of a sulfonated polyarylene ether sulfone polymer (sP) comprising step{'sub': 'G', 'claim-text': (A1) from 75 to 99.5 mol-% of at least one non-sulfonated aromatic dihalogen sulfone, based on the sum of the mol-% of components (A1) and (A2),', '(A2) from 0.5 to 25 mol-% of at least one sulfonated aromatic dihalogen sulfone, based on the sum of the mol-% of components (A1) and (A2),', '(B1) at least one aromatic dihydroxy component comprising trimethylhydroquinone,', '(C) at least one carbonate component,', '(D) at least one aprotic polar solvent, wherein component (B1) comprises at least mol-% of trimethylhydroquinone, based on the total amount of component (B1)., 'I) converting a reaction mixture (R) comprising as components'}16. The process according to claim 15 , wherein component (A1) is selected from the group consisting of 4 claim 15 ,4′-dichlorodiphenyl sulfone and 4 claim 15 ,4′-difluorodiphenyl sulfone.17. The process according to claim 15 , wherein component (A2) is at least one disulfonated aromatic dihalogen sulfone.18. The process according to claim 15 , wherein component (C) comprises at least 50 wt.-% of potassium carbonate claim 15 , based on the total weight of component (C).19. The ...

Method Of Producing A Polymeric Membrane

The present invention relates to a method of producing a polymeric membrane having a homogeneous porosity throughout the entire polymeric phase. The method comprises the steps of dissolving at least one amphiphillic block copolymer in a solvent to form a casting solution of the block copolymer, and contacting the extruded solution with non-solvent to induce phase separation and thereby producing an integral asymmetric polymeric membrane, wherein the amphiphillic block copolymer is an amphiphillic diblock copolymer, containing blocks of a polar copolymer and blocks of a benzocyclobutene copolymer, and wherein the integral asymmetric polymeric membrane is crosslinked by application of heat or radiation thereby producing a membrane having a homogeneous porosity throughout the entire polymeric phase. 1. A method for producing a polymeric membrane comprising the steps of:(a) dissolving at least one amphiphillic block copolymer in a solvent to form a casting solution of the block copolymer,(b) extruding the casting solution onto a carrier substrate to form a film,(c) evaporating a portion of the solvent near the surface during a standing period,(d) contacting the extruded solution with non-solvent to induce phase separation and thereby producing an integral asymmetric polymeric membrane in flat sheet geometry, and(e) crosslinking the integral asymmetric polymeric membrane by application of heat or radiation thereby producing a membrane having a homogeneous porosity throughout the entire polymeric phase,wherein the amphiphillic block copolymer is a amphiphillic block copolymer is an amphiphillic diblock copolymer, containing blocks of a polar copolymer and blocks of a benzocyclobutene copolymer.2. The method of claim 1 , wherein the amphiphillic block copolymer is an amphiphillic diblock copolymer containing blocks of a polar copolymer and blocks of a vinylbenzocyclobutene copolymer.3. The method of claim 2 , wherein the vinylbenzocyclobutene copolymer is 4- ...

DEVICE FOR DECOMPLEXATION AND ENHANCED REMOVAL OF COPPER BASED ON SELF-INDUCED FENTON-LIKE REACTION CONSTRUCTED BY ELECTROCHEMISTRY COUPLED WITH MEMBRANE SEPARATION, AND USE THEREOF

A device for decomplexation and enhanced removal of copper based on self-induced Fenton-like reaction constructed by electrochemistry coupled with membrane separation is disclosed. The device includes a reactor, two electrocatalytic anodes capable of generating hydroxyl radicals, an electrocatalytic cathode membrane assembly, a direct current power supply, an aeration system, an inlet pipe and an outlet pipe. The device of the present invention has a simple construction. Using this device to treat industrial wastewater containing copper complexes under specific conditions allows the decomplexation and the removal of the industrial wastewater containing the copper complexes to be simultaneously realized at a low consumption and a high efficiency. The coupling of electrochemistry with membrane separation can be achieved to protect the cathode from being contaminated by pollutants in the sewage and prolong the service life of the electrode. 1. A device for decomplexation and enhanced removal of copper based on a self-induced Fenton-like reaction constructed by electrochemistry coupled with membrane separation , comprising a reactor , two electrocatalytic anodes , an electrocatalytic cathode membrane assembly , a direct current power supply , an aeration system , an inlet pipe , and a first outlet pipe; wherein the two electrocatalytic anodes generate hydroxyl radicals , the two electrocatalytic anodes and the electrocatalytic cathode membrane assembly are both located in the reactor , the two electrocatalytic anodes are connected to a positive pole of the direct current power supply via a first wire , and the electrocatalytic cathode membrane assembly is located between the two electrocatalytic anodes , wherein the electrocatalytic cathode membrane assembly comprises a membrane bracket , a composite conductive microfiltration membrane and a second outlet pipe , the composite conductive microfiltration membrane is attached on both sides of the membrane bracket , the ...

METHOD FOR PREPARING AN ASYMMETRIC MEMBRANE

The present invention provides a method for the preparation of an asymmetric membranes. More particularly, the new method relates to the use of a crosslinker contacted via vapour or liquid phase with the surface layer of a cast polymer film, followed by the immersion of said film in a coagulation bath. The formation of a crosslinked skin layer and the solidification of the membrane bulk can thus be decoupled in time. 118.-. (canceled)19. A method for the preparation of an asymmetric membrane comprising a less porous top-layer as compared to an underlying membrane structure , wherein the method comprises:(a) casting a solution of a first polymer, wherein the first polymer can be cross-linked by a first reactive monomer;(b) contacting only an upper layer of the cast first polymer solution with a vapor or liquid phase comprising the first reactive monomer, wherein the first reactive monomer reacts with the first polymer thus crosslinking the first polymer within the upper layer of the cast polymer solution and forming the less porous top-layer; and(c) inducing phase inversion of the cast first polymer solution in order to obtain an asymmetric solidified membrane comprising the less porous top-layer.20. The method according to claim 19 , wherein in (b) the upper layer is contacted with a vapor comprising the first reactive monomer.21. The method according to claim 19 , wherein in (b) the upper layer is atomised with a liquid comprising the first reactive monomer.22. The method according to claim 19 , wherein the first polymer is selected from the group consisting of polyimide claim 19 , poly(vinyl alcohol) claim 19 , polystyrene claim 19 , polybenzimidazole claim 19 , sulfonated polyether ether ketone claim 19 , sulfonated polyether ketone claim 19 , sulfonated polysulfone claim 19 , and hydrolysed polyacrylonitrile claim 19 , and wherein the crosslinking of the first polymer in (b) by the first reactive monomer is of an ionic or a covalent nature.23. The method ...

Agarose ultrafiltration membrane composites for size based separations

The embodiments described herein relate to agarose ultrafiltration membrane composites and methods for making and using the same.

Ultrafiltration membranes and methods of making

The present invention is an integral multilayered composite membrane having at least one ultrafiltration layer made by cocasting or sequentially casting a plurality of polymer solutions onto a support to form a multilayered liquid sheet and immersing the sheet into a liquid coagulation bath to effect phase separation and form a multilayered composite membrane having at least one ultrafiltration layer.

PROCESS FOR THE PRODUCTION OF SOLVENT STABLE POLYMERIC MEMBRANES

The present invention relates to a process for preparing an asymmetric integrally skinned membrane for the separation of at least one solute from a solution, comprising the steps of: (a) preparing a polybenzimidazole dope solution comprising: (i) a polybenzimidazole polymer, and (ii) a solvent system for said polybenzimidazole which is water miscible; (b) casting a film of said dope solution onto a support; (c) immersing the film cast on the support into a coagulating medium to form an asymmetric integrally skinned membrane; (d) treating the membrane from step (c) with a cross-linking agent; (e) treating the membrane from step (d) with a cross-link modification agent. Further aspects relate to an asymmetric integrally skinned membrane and uses thereof. 1. A process for preparing an asymmetric integrally skinned membrane for the separation of at least one solute from a solution , comprising the steps of: (i) a polybenzimidazole polymer, and', '(ii) a solvent system for said polybenzimidazole which is water miscible;, '(a) preparing a polybenzimidazole dope solution comprising(b) casting a film of said dope solution onto a support;(c) immersing the film cast on the support into a coagulating medium to form an asymmetric integrally skinned membrane;(d) treating the membrane from step (c) with a cross-linking agent;(e) treating the membrane from step (d) with a cross-link modification agent.4. A process according to claim 1 , wherein the cross-linking agent is a multifunctional halide claim 1 , multifunctional sulfonate ester or a divinyl sulfone.5. A process according to claim 1 , wherein the cross-linking agent is selected from dibromoxylene claim 1 , dibromobutane claim 1 , tribromopropane claim 1 , trichloropropane claim 1 , pentaerythrityl tetrabromide claim 1 , pentaerythrityl tetrachloride claim 1 , 1 claim 1 ,3 claim 1 ,5-tri(bromomethyl)benzene claim 1 , 1 claim 1 ,2 claim 1 ,4 claim 1 ,5-tetra(bromomethyl)benzene and divinyl sulfone.6. A process according to ...

ASYMMETRIC MEMBRANES

Asymmetric membranes comprising a first asymmetric porous zone including a first porous asymmetry that increases from the first exterior surface through the first porous zone of the bulk, and a second asymmetric porous zone including a second porous asymmetry that increases from the second exterior surface through the second porous zone of the bulk, wherein the first average pore size is larger than the second average pore size, as well as methods of making and using the membranes, are disclosed. 1. An asymmetric membrane comprising(a) a first exterior porous surface;(b) a second exterior porous surface;(c) a porous bulk between the first exterior porous surface and the second exterior porous surface, the porous bulk having a first porous region and a second porous region, the first porous region contacting the second porous region;(d) a first asymmetric porous zone, the first asymmetric porous zone including the first exterior porous surface and a first asymmetric porous zone boundary in the porous bulk, and extending into, and including, the first porous region of the bulk to the first asymmetric zone boundary; and,(e) a second asymmetric porous zone, the second asymmetric porous zone including the second exterior porous surface and a second asymmetric porous zone boundary in the porous bulk, and extending into, and including, the second porous region of the bulk to the second asymmetric zone boundary;wherein the first asymmetric porous zone includes a first porous asymmetry that increases from the first exterior porous surface through the first porous region of the bulk to the first asymmetric zone boundary, and the second asymmetric porous zone includes a second porous asymmetry that increases from the second exterior porous surface through the second porous region of the bulk to the second asymmetric zone boundary, and the first exterior porous surface has a first average pore size and the second exterior porous surface has a second average pore size, wherein ...

COMPOSITION COMPRISING AROMATIC AND FLUORINATED POLYMERS AND USE THEREOF

The present invention relates to a composition comprising at least one aromatic polymer and at least one fluorinated polymer, articles made from such compositions and uses thereof. 1. A composition (C) comprising:at least one aromatic polymer (A), optionally, at least one monomer (a), wherein monomer (a) is a diol selected from the group consisting of poly-ether type diols, poly-ester type diols, polybutadien-diols and polycarbonate-diols;', 'at least one monomer (b), wherein monomer (b) is a hydroxy-terminated (per)fluoropolyether polymer;', 'at least one monomer (c), wherein monomer (c) is an aromatic, aliphatic or cycloaliphatic diisocyanate; and', 'at least one monomer (d), wherein monomer (d) is an aliphatic, cycloaliphatic or aromatic diol having from 1 to 14 carbon atoms; and, 'at least one F-TPU polymer, wherein said F-TPU polymer is a fluorinated polyurethane polymer comprising recurring units derived fromoptionally at least one further ingredient.2. A film comprising at least one layer obtained from a composition (C) , wherein composition (C) comprises:at least one aromatic polymer (A), and optionally at least one monomer (a), wherein monomer (a) is a diol selected from the group consisting of poly-ether type diols, poly-ester type diols, polybutadien-diols and polycarbonate-diols;', 'at least one monomer (b), wherein monomer (b) is a hydroxy-terminated (per)fluoropolyether polymer;', 'at least one monomer (c), wherein monomer (c) is an aromatic, aliphatic or cycloaliphatic diisocyanate; and', 'at least one monomer (d), wherein monomer (d) is an aliphatic, cycloaliphatic or aromatic diol having from 1 to 14 carbon atoms; and, 'at least one F-TPU polymer, wherein said F-TPU polymer is a fluorinated polyurethane polymer comprising recurring units derived fromoptionally at least one further ingredient.3. The film according to claim 2 , wherein said film is a dense film.4. A porous membrane comprising at least one layer obtained from a composition [composition ...

MICROPOROUS MATERIAL AND SYSTEMS AND METHODS FOR MAKING THE SAME

The invention disclosed herein generally relates to matrices comprising polymers and methods for preparing them. 1. An IV device comprising a matrix , capable of passage of water therethrough at a rate of at least 120 ml/minute , and further capable of full flow-stop performance at a drop distance of at least 1 meter.2. The IV device of claim 1 , wherein the drop distance is at least 1.5 meter.3. The IV device of claim 1 , wherein the rate is at least 140 ml/minute.4. A matrix capable of passage of water therethrough having a flow rate at 20° C. that meets or exceeds a flow value produced by application of Formula 1{'br': None, 'i': k', 'Bp−b, 'sub': '0', 'sup': 'L', 'Flow=·()\u2003\u2003Formula 1{'sub': 0', '0, 'where when the bubble point with water at 20° C. is between 0.01 and 0.25 MPa, k=31026, L=−1.00, and b=0.01034; and bubble point with water at 20° C. is greater than 0.25 MPa, k=5797, L=−1.35, and b=0.1379. In this formula, flow is expressed in L/m2/h, the pressure can be at 1 bar. The embodiment described in this formula is for membranes of thickness in the range of approximately 100-140 micrometers.'}5. The matrix of claim 4 , wherein the drop distance is at least 1.5 meter.6. The matrix of claim 4 , wherein the rate is at least 140 ml/minute.7. The matrix of claim 4 , having a composition comprising at least one substantially non-sulfonated polymer and a compatible polymer claim 4 , wherein the compatible polymer is compatible with the substantially non-sulfonated polymer.8. The matrix of claim 7 , wherein the compatible polymer comprises a sulfone polymer.9. The matrix of claim 7 , wherein the sulfone polymer comprises polyethersulfone (PES).10. The matrix of claim 7 , wherein the substantially non-sulfonated polymer comprises polyvinylpyrrolidone (PVP).1113.-. (canceled)14. A method of producing a porous claim 7 , hydrogel matrix claim 7 , said method comprising providing a dope mix comprising at least one matrix polymer and at least one non-solvent ...

Abrasion-proof filtration membrane and method of producing said membrane

A filtration membrane ( 1 ) is provided that includes a porous support ( 4 ) and a membrane layer having a first and a second zone ( 2, 3 ). The first zone ( 2 ) has a thickness of 5 to 15 μm and an average pore opening size of smaller/equal 0.4 and the second zone ( 3 ) has a thickness of 5 to 40 μm and an average pore opening size of 0.5 to 5.0 μm. The filtration membrane ( 1 ) is produced by forming a single- or -double-layer coating on the porous support ( 4 ).

METHANESULFONIC ACID MEDIATED SOLVENT FREE SYNTHESIS OF CONJUGATED POROUS POLYMER NETWORKS

The present disclosure relates to synthesis of porous polymer networks and applications of such materials. 1. A method for the preparation of porous polymer network comprising: (i) a plurality of compounds comprising at least one acetyl group, said plurality of compounds comprising at least one compound type, and', '(ii) an alkylsulfonic acid, and, '(a) providing(b) treating said compounds under such conditions that reaction occurs to produce a porous polymer network.2. The method of claim 1 , wherein said alkylsulfonic acid is methanesulfonic acid.3. The method of claim 1 , wherein said method is lacking a toxic acid.4. The method of claim 1 , wherein said method is lacking an acid that decomposes at high temperatures.5. The method of claim 1 , wherein said reaction occurs in open air conditions.6. The method of claim 1 , wherein said method further provides additional elements which become embedded within the porous polymer network after the reaction.7. The method of claim 6 , wherein said additional elements comprise nanotubes.8. The method of claim 1 , wherein said method includes more than one compound type.9. The method of claim 1 , wherein said method includes only one compound type comprising at least one acetyl group.10. The method of claim 1 , wherein said porous polymer network comprises a conjugated porous polymer network.11. The method of claim 1 , wherein said reaction comprises an aldol triple condensation.12. The method of claim 1 , wherein said compound type is acetophenone.14. The method of claim 1 , wherein said compound type is selected from the group consisting of:15. The method of claim 1 , wherein said porous polymer network produced has a specific surface area of greater than 1000 m/g with a pore volume of 0.40 cm/g.16. The method of claim 1 , wherein said compound comprising at least one acetyl group and said acid are in a homogenous solution at or before step b).17. The method of claim 1 , wherein said conditions comprise heating.18. The ...

Zero polar distance ion exchange membrane and preparation method thereof

A zero polar distance ion exchange membrane. A polymer membrane is compositely prepared by a perfluorinated ion exchange resin and a reinforcing material, and the polymer membrane is converted into an ion exchange membrane. A non-electrode porous gas release layer is adhered to at least one side of the ion exchange membrane. The non-electrode porous gas release layer is formed by drying after adhering a dispersion liquid to an ion exchange membrane layer surface. The dispersion liquid is formed by dispersing perfluorinated sulphonic acid resin broken micro-particles in a sulphonic acid resin aqueous alcohol solution. The prepared zero polar distance ion exchange membrane is used in the chlor-alkali industry, stably and effectively treats an alkali metal chloride solution having a high impurity content, is able to better suited for operating in a zero polar distance electrolysis cell under high current density conditions, and has a very low surface resistance. Also provided is a preparation method for the zero polar distance ion exchange membrane. The preparation method has a simple and reasonable process, and facilitates industrial production. 1. A zero polar distance ion exchange membrane , wherein:the zero polar distance ion exchange membrane is a polymer membrane compositely prepared by perfluorinated ion exchange resin and a reinforcement material; the polymer membrane is converted to an ion exchange membrane, a non-electrode multi-porous gas release layer is attached to at least one side of the ion exchange membrane; the non-electrode multi-porous gas release layer is formed by drying after adhering a dispersion liquid to an ion exchange membrane surface; the dispersion liquid is formed by dispersing perfluorosulfonic acid resin broken micro-particles in a sulfonic acid resin water alcohol solution.2. The zero polar distance ion exchange membrane claim 1 , as recited in claim 1 , wherein: the perfluorosulfonic acid resin broken micro-particles are formed by ...

COMPOSITES COMPRISING NOVEL RTIL-BASED POLYMERS, AND METHODS OF MAKING AND USING SAME

The invention includes compositions comprising curable imidazolium-functionalized poly(room-temperature ionic liquid) copolymers and homopolymers. The invention further includes methods of preparing and using the compositions of the invention. The invention further includes novel methods of preparing thin, supported, room-temperature ionic liquid-containing polymeric films on a porous support. In certain embodiments, the methods of the invention avoid the use of a gutter layer, which greatly reduces the overall gas permeance and selectivity of the composite membrane. In other embodiments, the films of the invention have increased gas selectivity and permeance over films prepared using methods described in the prior art. 1. A composition comprising a curable imidazolium-functionalized poly(room temperature ionic liquid) (poly(RTIL)) copolymer ,wherein the copolymer comprises a plurality of imidazolium-functionalized monomeric units,wherein (100×(1−p)) % of the monomeric units comprise a side-chain imidazolium group substituted with a curable group,further wherein (100×p) % of the monomeric units comprise a side-chain imidazolium group substituted with a non-curable group,wherein p ranges from 0 to 1.3. The composition of claim 1 , wherein p ranges from about 0 to about 0.8.6. The composition of claim 1 , wherein the composition is at least partially cured.7. The composition of claim 1 , further comprising at least one component selected from the group consisting of an imidazolium-functionalized RTIL claim 1 , polymerization initiator claim 1 , and imidazolium-based RTIL monomer.8. The composition of claim 7 , wherein at least 50 wt % of the RTIL-containing material in the composition corresponds to the imidazolium-functionalized RTIL.9. The composition of claim 1 , wherein the composition is embedded within a porous support membrane or deposited as a layer on the surface of a porous support membrane.10. The composition of claim 9 , wherein the composition is at least ...

Methanesulfonic Acid Mediated Solvent Free Synthesis of Conjugated Porous Polymer Networks

The present disclosure relates to synthesis of porous polymer networks and applications of such materials. The present disclosure relates to a method of fabricating of a porous polymer network comprising: (a) providing: (i) a first reactant comprising a plurality of compounds comprising at least one acetyl group, said plurality of compounds comprising at least one compound type, and (ii) a second reactant comprising an alkylsulfonic acid, and (b) creating a solution of said reactants, (c) casting said solution in a form, and (d) treating said solution under such conditions so as to produce a porous polymer network. In one embodiment, the invention relates to a porous polymer network which has a basic structure selected from the group consisting of 122-. (canceled)48. The mixture of claim 47 , wherein said solution is in a cast or mold.49. The mixture of claim 47 , wherein said alkylsulfonic acid is methanesulfonic acid.50. (canceled)51. (canceled)52. (canceled)53. The mixture of claim 47 , wherein said mixture comprises additional elements selected from the group consisting of: carbon nanotubes claim 47 , metal nanowires claim 47 , dendritic metal micro/nano-particles claim 47 , carbon nanofibers claim 47 , redox active metaloxide nanoparticles claim 47 , graphene claim 47 , graphene oxide claim 47 , and reduced graphene oxide.55. The mixture of claim 47 , wherein said mixture comprises a homogenous solution. The present application claims the benefit of copending U.S. patent application Ser. No. 15/863,095, filed Jan. 5, 2018, which claims the benefit of U.S. Provisional Patent Application No. 62/444,479, filed on Jan. 10, 2017, now expired, which is incorporated herein by reference.The present disclosure relates to synthesis of porous polymer networks and applications of such materials.The large-scale production and applications of porous polymer networks (PPNs) confronts two major challenges: On one hand, the commonly used reactions for PPNs synthesis are ...

SEPARATION MEMBRANE, COMPOSITE SEPARATION MEMBRANE, AND METHOD FOR PRODUCING SEPARATION MEMBRANE

The separation membrane of the present invention includes: a separation function layer including a high-molecular polymer as a matrix and an amine compound represented by the formula [I] and/or [II] below; and hydrophobic layers arranged on both faces of the separation function layer. The separation function layer includes a crack inhibitor. 2. The separation membrane according to claim 1 , wherein the crack inhibitor is a high-molecular compound that does not participate in a polymerization reaction of a polymerizable monomer for forming the high-molecular polymer claim 1 , or the crack inhibitor is a high-molecular compound that does not participate in a crosslinking reaction of the high-molecular polymer.3. The separation membrane according to claim 1 , wherein the crack inhibitor comprises at least one selected from polyvinylpyrrolidone claim 1 , polyethylene glycol claim 1 , polydiallyldimethylammonium chloride claim 1 , chitosan claim 1 , and a cellulose derivative.4. The separation membrane according to claim 3 , wherein the crack inhibitor is polyvinylpyrrolidone that is a linear polymer of N-vinyl-2-pyrrolidone.5. The separation membrane according to claim 3 , wherein the polyvinylpyrrolidone is contained in an amount of 2 to 20 mass % relative to the high-molecular polymer of the separation function layer.6. The separation membrane according to claim 3 , wherein the crack inhibitor is polyethylene glycol.7. The separation membrane according to claim 3 , wherein the cellulose derivative comprises at least one selected from hydroxypropion cellulose and carboxymethyl cellulose.8. The separation membrane according to claim 1 , wherein a material forming the hydrophobic layer is a silicone elastomer.9. The separation membrane according to claim 1 , wherein the amine compound is a polyamidoamine dendrimer.10. A composite separation membrane comprising:a porous support membrane; and{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the separation membrane ...

RADIATION CURED MEMBRANES DERIVED FROM POLYMERS THAT ARE CO-REACTIVE WITH AZIDE CROSSLINKING AGENT(S)

The present invention appreciates that compounds comprising nitrogen-containing moieties that are at least divalent (e.g., urea, urethane, amide, etc.) can be reacted with azides using at least radiation energy to initiate the reaction between at least a portion of the compounds and the azides to form membranes that have surprisingly high selectivities for acid gases relative to nonpolar gases such as hydrocarbons. The membranes are also resistant to CO2 plasticization and have high acid gas flux characteristics. The resultant membranes can be extremely thin (e.g., 10 micrometers or less), which promotes high permeability for the acid gas and can translate into high productivity on a scaled-up, industrial level. 112-. (canceled)13. A method of making a membrane comprising: [ A) a thermoplastic polyurethane ; and', 'B) at least one azide crosslinking agent comprising two or more azide moieties that are co-reactive with the thermoplastic polyurethane, wherein the azide crosslinking agent is present in an amount of no more than 15 wt. % of the total curable composition;, 'i) a curable composition comprising, 'ii) a solvent; and', 'iii) a non-solvent;, 'a) forming a solution comprisingb) conducting a phase inversion of the solution to form a membrane structure; andc) exposing the membrane structure to ultraviolet or electron beam radiation so as to substantially cure the membrane structure and form a membrane.15. The method of claim 13 , wherein the thermoplastic polyurethane has at least one thermal transition temperature and wherein the membrane structure is at a temperature below one or more of the thermal transition temperatures for at a least a portion of the time period that the membrane structure is exposed to ultraviolet or electron beam radiation-so as to substantially cure the membrane structure and form a membrane.16. The method of claim 13 , wherein the membrane structure is at a first temperature for at least a portion of the forming time period claim 13 , ...

POROUS MEMBRANES MADE OF CROSS-LINKABLE SILICONE COMPOSITIONS

The invention relates to a method for producing thin porous membranes made of cross-linkable silicone compositions (S), according to which method an emulsion is formed from the silicone compositions (S) using a pore forming agent (P) in the presence of an emulsifier (E) and optionally solvent (L) in a first step, the emulsion is given a form and the solvent (L), if present, is allowed to evaporate in a second step, the emulsion is cross-linked in a third step, and the pore forming agent (P) is removed from the cross-linked membrane in a fourth step. The invention further relates to membranes that can be produced according to the method and to the use thereof for separating mixtures, in adhesive plasters, as a water-repellent and breathable layer in textiles or as packaging materials. 1. A process for producing a thin porous membrane having a layer thickness of 1 μm to 2000 μm from a crosslinkable silicone composition (S) , said process comprising:a first step comprising forming an emulsion from the silicone composition (S) with a pore-former (P), which is selected from the group consisting of monomeric glycols, oligomeric glycols, polymeric glycols and glycerol, in a presence of an emulsifier (E), which is selected from the group consisting of polydimethylsiloxanes having polyetheroxy, alkoxy and ammonium groups, ethylene oxide-propylene oxide copolymers, polyalkylene glycol ethers, polysorbates, sorbitan fatty acid esters, catatonic surfactants and anionic surfactants, and optionally a solvent (L), which is selected from the group consisting of ethers, esters, ketones, sterically hindered alcohols, amides aromatic hydrocarbons, aliphatic hydrocarbons, and hydrochlorocarbons,a second step comprising introducing the emulsion into a mold and evaporating any solvent (L),a third step comprises crosslinking the emulsion to form a crosslinked membrane, anda fourth step comprises removing the pore-former (P) from the crosslinked membrane,wherein said crosslinkable silicone ...

Method for the Production of Positively Charged Membranes

The present invention relates to a method for the production of a positively charged membrane. Furthermore the present invention relates to a positively charged membrane obtainable by the methods of present invention and the use of these positively charged membranes. 1. A method for the production of a positively charged membrane , the method comprising the following stepsa) mixing at least an aprotic solvent, a polyarylether, 2,3,4,5-tetrahydrothiophene-1,1-dioxide and a polycation;b) heating of the mixture above the critical mixing temperature of the polyarylether to obtain a clear and homogenous mixture;c) let the mixture cool down to below said critical mixing temperature, preferable to room temperature;d) followed by non-solvent induced phase separation resulting in the formation of the positively charged membranes.2. The method according to claim 1 , wherein 2 claim 1 ,3 claim 1 ,4 claim 1 ,5-tetrahydrothiophene-1 claim 1 ,1-dioxide is present in the homogenous mixture from 50% to 80% claim 1 , preferably from 55% to 70% claim 1 , more preferably from 60% to 65% claim 1 , based on the total weight of the mixture.3. The method according to claim 1 , wherein the polyarylether is present in the homogenous mixture from 10% to 30% claim 1 , preferably from 15% to 25% claim 1 , most preferably 17% to 21% claim 1 , based on the total weight of the mixture.4. The method according to claim 1 , wherein the polyarylether is polyethersulfone or sulfonated polyethersulfone or a mixture thereof.5. The method according to claim 1 , wherein the aprotic solvent is present in the homogenous mixture from 1% to 50% claim 1 , preferably from 5% to 30% claim 1 , most preferably from 10% to 20% claim 1 , based on the total weight of the mixture.6. The method according to claim 1 , wherein the aprotic solvent is selected from the group consisting of N-methyl-2-pyrrolidone claim 1 , tetrahydrofuran claim 1 , ethyl acetate claim 1 , acetone claim 1 , dimethylformamide claim 1 , ...

Perfluoropolymer hollow fiber composite membrane preparation method

A perfluoropolymer hollow fiber composite membrane preparation method includes the steps of (A) preparing a supporting layer of the perfluoropolymer hollow fiber composite membrane, (B) preparing a membrane casting solution, which includes obtaining a mixed solution by mixing a perfluoropolymer water dispersion emulsion, a spinning carrier and solvent, and defoaming the mixed solution at vacuum and a constant temperature, (C) preparing a nascent hollow fiber composite membrane, which includes compositing by uniformly coating the membrane casting solution on an outer surface of the supporting layer through an annular spinneret using chemical fiber concentric circle composite spinning technology, putting the supporting layer after compositing into a coagulant, solidifying and forming, and (D) drying after putting the nascent hollow fiber composite membrane to a hot air box, cleaning, sintering, and performing heat preservation. The prepared membrane has a thin wall, thermal and chemical resistance and good mechanical performance. 1. A perfluoropolymer hollow fiber composite membrane preparation method comprising the steps of:(A) preparing a supporting layer of a perfluoropolymer hollow fiber composite membrane;(B) preparing a membrane casting solution, which comprises obtaining a mixed solution by mixing a perfluoropolymer water dispersion emulsion, a spinning carrier and solvent at a temperature in a range of 60−90° C., and defoaming the mixed solution at a constant temperature, so that the membrane casting solution is obtained, wherein a proportion of the perfluoropolymer water dispersion emulsion in the mixed solution is in a range of 10-40 wt. %, a proportion of the spinning carrier in the mixed solution is in a range of 5-20 wt. %, and a proportion of the solvent in the mixed solution is in a range of 40-85 wt. %;(C) preparing a nascent hollow fiber composite membrane, which comprises compositing by uniformly coating the membrane casting solution on an outer ...

RICE-HUSK DERIVED SILICON CARBIDE MEMBRANE SORBENT FOR OIL REMOVAL

A membrane sorbent is described, which comprises 1-6 wt % silicon carbide nanoparticles dispersed in a polymer matrix. The polymer matrix may comprise polysulfone and polyvinylpyrrolidone. The membrane sorbent is used for separating oil from a contaminated water mixture. The silicon carbide nanoparticles of the membrane sorbent may be made from rice husk ash. 1. A membrane sorbent , comprising:silicon carbide nanoparticles dispersed in a polymer matrix,the polymer matrix comprising: a polysulfone polymer, anda second polymer;wherein the membrane sorbent comprises the silicon carbide nanoparticles at a weight percentage in a range of 1-6 wt % relative to the total weight of the membrane sorbent.2. The membrane sorbent of claim 1 , wherein a weight ratio of the polysulfone polymer to the second polymer is in a range of 1.0-5.0.3. The membrane sorbent of claim 1 , which has a porosity in a range of 55-70%.4. The membrane sorbent of claim 1 , wherein the silicon carbide nanoparticles have a surface area in a range of 80 to 180 m/g.5. The membrane sorbent of claim 1 , wherein the silicon carbide nanoparticles have an average pore size in a range of 2.7 to 3.5 nm and a pore volume in a range of 0.15 to 0.35 cm/g.6. The membrane sorbent of claim 1 , wherein the second polymer is at least one selected from the group consisting of polyvinylpyrrolidone claim 1 , polyethylene claim 1 , polypropylene claim 1 , polyisobutylene claim 1 , polystyrene claim 1 , polyvinylchloride claim 1 , and ethylene vinyl acetate copolymer.7. The membrane sorbent of claim 6 , wherein the second polymer is polyvinylpyrrolidone.8. The membrane sorbent of claim 7 , consisting essentially of the silicon carbide nanoparticles and the polymer matrix claim 7 , andwherein the polymer matrix consists essentially of the polysulfone polymer and polyvinylpyrrolidone.9. The membrane sorbent of claim 1 , wherein the membrane sorbent is hydrophilic claim 1 , having an exterior surface with a water drop contact ...

CHEMICALLY RESISTANT FLUORINATED MULTIBLOCK POLYMER STRUCTURES, METHODS OF MANUFACTURING AND USE

Multi-block isoporous structures for non-aqueous and/or harsh chemical media having at least one of high separation specificity, chemical resistance, and antifouling properties, methods of manufacturing and use, for replacements or alternatives to existing separation membrane technologies. 1. A multiblock fluorinated polymer material comprising at least two distinct polymer blocks , containing at least one of macro , meso , or micro pores , at least some of which are isoporous , wherein at least a portion of at least one polymer block is fluorinated.2. The multiblock fluorinated material of wherein the material comprises a diblock copolymer comprising two distinct polymer blocks claim 1 , containing at least one of macro claim 1 , meso claim 1 , or micro pores claim 1 , at least some of which are isoporous claim 1 , whereon at least a portion of at least one polymer block is fluorinated.3. The material of is one of asymmetric or symmetric.4. The material of further containing macroporous domains and mesoporous wall structures in a single claim 1 , integral scalable structure.5. The material of further containing continuous macroporous domains.6. The material of claim 1 , wherein the material has mesopores comprising a size of about 1-200 nm.7. The material of wherein the material is formed into a two-dimensional structure.8. The material of wherein the material is formed into a three-dimensional structure.9. A method of preparing the material of claim 1 , wherein at least a portion of the isoporous material is fluorinated before the formation of the isoporous structure.10. A method of preparing the material of claim 1 , wherein at least a portion of the isoporous material is fluorinated after the formation of the isoporous structure.11. A method of preparing the material of claim 1 , comprising incorporating fluorinated monomer as at least a portion of the monomer feed claim 1 , polymerizing the monomers to form a multiblock fluorinated polymer claim 1 , and then ...

MICROPOROUS SHEET PRODUCT AND METHODS FOR MAKING AND USING THE SAME

Microporous sheet product and methods of making and using the same. In one embodiment, the microporous sheet product is made by a process that includes melt-extruding a sheet material using an extrusion mixture that includes (i) a cyclic olefin copolymer, (ii) an electrolyte swellable thermoplastic, and (iii) a compatibilizing agent that promotes mixing of the cyclic olefin copolymer and the electrolyte swellable thermoplastic, the compatibilizing agent having a boiling point in the range of 135-300° C. As an example, the cyclic olefin copolymer may be an ethylene-norbornene copolymer, the electrolyte swellable thermoplastic may be polyethylene oxide, and the compatibilizing agent may be mineral spirits. After extrusion, the sheet material may be cooled, and the compatibilizing agent may be removed, forming an ionically-conductive microporous sheet product. The microporous sheet product has high-temperature stability and gels when exposed to a liquid electrolyte, enabling high ionic conductivity when used as a battery separator. 1. A microporous sheet product made by a method comprising (a) forming a mixture of (i) a cyclic olefin copolymer , (ii) an electrolyte swellable thermoplastic , and (iii) a compatibilizing agent that promotes mixing of the cyclic olefin copolymer and the electrolyte swellable thermoplastic , the compatibilizing agent having a boiling point in the range of 135-300° C.; (b) casting the mixture to form a sheet material; and (c) cooling the sheet material.2. The microporous sheet product as claimed in wherein the cyclic olefin copolymer comprises an ethylene-norbornene cyclic olefin copolymer.3. The microporous sheet product as claimed in wherein the cyclic olefin copolymer has a glass transition temperature of about 70-180° C.4. The microporous sheet product as claimed in wherein the cyclic olefin copolymer has a glass transition temperature above 90° C.5. The microporous sheet product as claimed in wherein the cyclic olefin copolymer has a ...

POROUS MEMBRANE, BLOOD PURIFYING MODULE INCORPORATING POROUS MEMBRANE, AND METHOD FOR PRODUCING POROUS MEMBRANE

The purpose of the present invention is to provide a porous membrane that has both high water permeability and excellent protein fractionation performance. Provided is a method for producing a porous membrane, said method comprising a step for discharging a membrane-forming dope that contains a hydrophilic polymer from a slit formed in a mouthpiece, and a step for, after the passage of the discharged membrane-forming dope through a dry part, solidifying the membrane-forming dope in a coagulation bath to give a porous membrane, wherein the cross-section area of the slit is 3-30 times inclusive as large as the cross-section area of the solidified porous membrane. 1. A porous membrane used for blood purification containing a hydrophilic polymer at a content of at least 0.5% by weight and up to 8% by weight wherein pores formed on one surface satisfy the following (A) and (B):(A) average of ratio of the major diameter to the minor diameter of the pores is at least 3, and(B) average of the minor diameter of the pores is at least 5 nm and up to 20 nm and a standard deviation is up to 4 nm.2. A porous membrane according to wherein pores formed on the other surface satisfy the following (C) and (D):(C) average of ratio of the major diameter to the minor diameter of the pores is at least 1.5, and(D) average of the minor diameter of the pores is at least 0.2 μm and up to 0.6 μm.3. A porous membrane according to wherein porosity of the surface formed with the pores satisfying the (A) and (B) is at least 1% and up to 10%.4. A porous membrane according to wherein material constituting the main component is an amorphous polymer.5. A porous membrane according to wherein the amorphous polymer is a polysulfone polymer.6. A porous membrane according to wherein the hydrophilic polymer is polyvinylpyrrolidone claim 1 , polyvinyl alcohol claim 1 , polyethylene glycol claim 1 , or a copolymer thereof.7. A porous membrane according to wherein the hydrophilic polymer is ...

METHODS OF FILTERING HYDROCARBONS FROM AN AQUEOUS MIXTURE

A method of separating hydrocarbons in an aqueous mixture comprising exposing the aqueous mixture to a cellulose/ionic liquid membrane, wherein the aqueous mixture includes hydrocarbons, and removing the hydrocarbons from the aqueous mixture as the aqueous mixture flows through the cellulose/ionic liquid membrane, wherein the hydrocarbons do not flow through the cellulose/ionic liquid membrane. A filter system, comprising a cellulose/ionic liquid membrane used as the filter to separate hydrocarbons from an aqueous mixture. 1. A method of separating hydrocarbons in an aqueous mixture , comprising:exposing an aqueous mixture to a cellulose/ionic liquid membrane, wherein the aqueous mixture includes hydrocarbons, andremoving the hydrocarbons from the aqueous mixture as the aqueous mixture flows through the cellulose/ionic liquid membrane, wherein the cellulose/ionic liquid membrane prevents the passage of the hydrocarbons through the membrane.2. The method of claim 1 , wherein the hydrocarbon is crude oil.3. The method of claim 1 , wherein a concentration of hydrocarbons in the aqueous mixture ranges from about 200 ppm to about 1000 ppm.4. The method of claim 1 , wherein the aqueous mixture is an oil-water emulsion.5. The method of claim 1 , wherein the aqueous mixture is acidic claim 1 , basic claim 1 , or neutral.6. The method of claim 1 , wherein the aqueous mixture has a pH ranging from about 3 to about 11.7. The method of claim 1 , wherein the aqueous mixture includes a surfactant.8. The method of claim 7 , wherein the surfactant is anionic claim 7 , cationic claim 7 , or neutral.9. The method of claim 7 , wherein the surfactant is one or more of sodium dodecylbenzenesulfonyl claim 7 , hexadecyltrimethylammonium bromide claim 7 , and polysorbate 80.10. The method of claim 1 , wherein a ratio of surfactant to oil in the aqueous mixture is about 1:10.11. The method of claim 1 , wherein a pure water permeance of about 75 to 150 Lmhbarand a hydrocarbon-water permeance ...